<?xml version="1.0" encoding="US-ASCII" standalone="no"?>
    <!-- Field: Doc-Info; Name: Generator; Value: GoFiler Complete; Version: 4.11b -->
    <!-- Field: Doc-Info; Name: VendorURI; Value: http://www.novaworks.co -->
    <!-- Field: Doc-Info; Name: Source; Value: 158808 12312015 10K.xfr; Date: 2016%2D03%2D27T13:06:29Z -->
    <!-- Field: Doc-Info; Name: Status; Value: 0x00000000 -->
<link:linkbase xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xbrli="http://www.xbrl.org/2003/instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
    <link:roleRef roleURI="http://fusiontel.com/role/DocumentAndEntityInformation" xlink:href="fsnn-20151231.xsd#DocumentAndEntityInformation" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/BalanceSheets" xlink:href="fsnn-20151231.xsd#BalanceSheets" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/BalanceSheetsParenthetical" xlink:href="fsnn-20151231.xsd#BalanceSheetsParenthetical" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/StatementsOfOperations" xlink:href="fsnn-20151231.xsd#StatementsOfOperations" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/StatementsOfOperationsParenthetical" xlink:href="fsnn-20151231.xsd#StatementsOfOperationsParenthetical" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/StatementsOfChangesInStockholdersDeficitUsd" xlink:href="fsnn-20151231.xsd#StatementsOfChangesInStockholdersDeficitUsd" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/InterimStatementsOfCashFlows" xlink:href="fsnn-20151231.xsd#InterimStatementsOfCashFlows" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/InterimStatementsOfCashFlowsParenthetical" xlink:href="fsnn-20151231.xsd#InterimStatementsOfCashFlowsParenthetical" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/NatureOfOperations" xlink:href="fsnn-20151231.xsd#NatureOfOperations" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/SignificantAccountingPolicies" xlink:href="fsnn-20151231.xsd#SignificantAccountingPolicies" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/LossPerShare" xlink:href="fsnn-20151231.xsd#LossPerShare" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/Stock-basedCompensation" xlink:href="fsnn-20151231.xsd#Stock-basedCompensation" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/Acquisition" xlink:href="fsnn-20151231.xsd#Acquisition" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/IntangibleAssets" xlink:href="fsnn-20151231.xsd#IntangibleAssets" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/PrepaidExpensesAndOtherCurrentAssets" xlink:href="fsnn-20151231.xsd#PrepaidExpensesAndOtherCurrentAssets" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/AccountsPayableAndAccruedExpenses" xlink:href="fsnn-20151231.xsd#AccountsPayableAndAccruedExpenses" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/PropertyAndEquipment" xlink:href="fsnn-20151231.xsd#PropertyAndEquipment" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/EquipmentFinancingObligations" xlink:href="fsnn-20151231.xsd#EquipmentFinancingObligations" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/SupplementalDisclosureOfCashFlowInformation" xlink:href="fsnn-20151231.xsd#SupplementalDisclosureOfCashFlowInformation" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/DueToRootaxcessSeller" xlink:href="fsnn-20151231.xsd#DueToRootaxcessSeller" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/SecuredCreditFacility" xlink:href="fsnn-20151231.xsd#SecuredCreditFacility" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/NotesPayable-non-relatedParties" xlink:href="fsnn-20151231.xsd#NotesPayable-non-relatedParties" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/NotesPayable-relatedParties" xlink:href="fsnn-20151231.xsd#NotesPayable-relatedParties" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/EquityTransactions" xlink:href="fsnn-20151231.xsd#EquityTransactions" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/DerivativeLiability" xlink:href="fsnn-20151231.xsd#DerivativeLiability" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/FairValueDisclosures" xlink:href="fsnn-20151231.xsd#FairValueDisclosures" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/IncomeTaxes" xlink:href="fsnn-20151231.xsd#IncomeTaxes" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/CommitmentsAndContingencies" xlink:href="fsnn-20151231.xsd#CommitmentsAndContingencies" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/ProfitSharingPlan" xlink:href="fsnn-20151231.xsd#ProfitSharingPlan" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/Concentrations" xlink:href="fsnn-20151231.xsd#Concentrations" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/SegmentInformation" xlink:href="fsnn-20151231.xsd#SegmentInformation" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/RelatedPartyTransactions" xlink:href="fsnn-20151231.xsd#RelatedPartyTransactions" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/SubsequentEvents" xlink:href="fsnn-20151231.xsd#SubsequentEvents" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/SignificantAccountingPoliciesPolicies" xlink:href="fsnn-20151231.xsd#SignificantAccountingPoliciesPolicies" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/SignificantAccountingPoliciesTables" xlink:href="fsnn-20151231.xsd#SignificantAccountingPoliciesTables" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/LossPerShareTables" xlink:href="fsnn-20151231.xsd#LossPerShareTables" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/Stock-basedCompensationTables" xlink:href="fsnn-20151231.xsd#Stock-basedCompensationTables" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/AcquisitionsTables" xlink:href="fsnn-20151231.xsd#AcquisitionsTables" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/IntangibleAssetsTables" xlink:href="fsnn-20151231.xsd#IntangibleAssetsTables" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/PrepaidExpensesAndOtherCurrentAssetsTables" xlink:href="fsnn-20151231.xsd#PrepaidExpensesAndOtherCurrentAssetsTables" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/AccountsPayableAndAccruedExpensesTables" xlink:href="fsnn-20151231.xsd#AccountsPayableAndAccruedExpensesTables" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/PropertyAndEquipmentTables" xlink:href="fsnn-20151231.xsd#PropertyAndEquipmentTables" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/EquipmentFinancingObligationsTables" xlink:href="fsnn-20151231.xsd#EquipmentFinancingObligationsTables" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/SupplementalDisclosureOfCashFlowInformationTables" xlink:href="fsnn-20151231.xsd#SupplementalDisclosureOfCashFlowInformationTables" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/NotesPayableNon-relatedPartiesTables" xlink:href="fsnn-20151231.xsd#NotesPayableNon-relatedPartiesTables" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/NotesPayableRelatedPartiesTables" xlink:href="fsnn-20151231.xsd#NotesPayableRelatedPartiesTables" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/EquityTransactionsTables" xlink:href="fsnn-20151231.xsd#EquityTransactionsTables" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/DerivativeLiabilityTables" xlink:href="fsnn-20151231.xsd#DerivativeLiabilityTables" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/FairValueDisclosuresTables" xlink:href="fsnn-20151231.xsd#FairValueDisclosuresTables" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/IncomeTaxesTables" xlink:href="fsnn-20151231.xsd#IncomeTaxesTables" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/CommitmentsAndContingenciesTables" xlink:href="fsnn-20151231.xsd#CommitmentsAndContingenciesTables" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/ConcentrationsTables" xlink:href="fsnn-20151231.xsd#ConcentrationsTables" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/SegmentInformationTables" xlink:href="fsnn-20151231.xsd#SegmentInformationTables" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/SignificantAccountingPoliciesDetails" xlink:href="fsnn-20151231.xsd#SignificantAccountingPoliciesDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/SignificantAccountingPoliciesDetails1" xlink:href="fsnn-20151231.xsd#SignificantAccountingPoliciesDetails1" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/SignificantAccountingPoliciesDetails2" xlink:href="fsnn-20151231.xsd#SignificantAccountingPoliciesDetails2" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/SignificantAccountingPoliciesDetails3" xlink:href="fsnn-20151231.xsd#SignificantAccountingPoliciesDetails3" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/SignificantAccountingPoliciesDetails4" xlink:href="fsnn-20151231.xsd#SignificantAccountingPoliciesDetails4" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/SignificantAccountingPoliciesDetails5" xlink:href="fsnn-20151231.xsd#SignificantAccountingPoliciesDetails5" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/SignificantAccountingPoliciesDetailsNarrative" xlink:href="fsnn-20151231.xsd#SignificantAccountingPoliciesDetailsNarrative" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/LossPerShareDetails" xlink:href="fsnn-20151231.xsd#LossPerShareDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/LossPerShareDetails1" xlink:href="fsnn-20151231.xsd#LossPerShareDetails1" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/Stock-basedCompensationDetails" xlink:href="fsnn-20151231.xsd#Stock-basedCompensationDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/Stock-basedCompensationDetails1" xlink:href="fsnn-20151231.xsd#Stock-basedCompensationDetails1" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/Stock-basedCompensationDetails2" xlink:href="fsnn-20151231.xsd#Stock-basedCompensationDetails2" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/AcquisitionDetails" xlink:href="fsnn-20151231.xsd#AcquisitionDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/AcquisitionDetails1" xlink:href="fsnn-20151231.xsd#AcquisitionDetails1" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/AcquisitionDetailsNarrative" xlink:href="fsnn-20151231.xsd#AcquisitionDetailsNarrative" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/IntangibleAssetsDetails" xlink:href="fsnn-20151231.xsd#IntangibleAssetsDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/IntangibleAssetsDetails1" xlink:href="fsnn-20151231.xsd#IntangibleAssetsDetails1" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/PrepaidExpensesAndOtherCurrentAssetsDetails" xlink:href="fsnn-20151231.xsd#PrepaidExpensesAndOtherCurrentAssetsDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/AccountsPayableAndAccruedExpensesDetails" xlink:href="fsnn-20151231.xsd#AccountsPayableAndAccruedExpensesDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/PropertyAndEquipmentDetails" xlink:href="fsnn-20151231.xsd#PropertyAndEquipmentDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/PropertyAndEquipmentDetailsNarrative" xlink:href="fsnn-20151231.xsd#PropertyAndEquipmentDetailsNarrative" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/EquipmentFinancingObligationsDetails" xlink:href="fsnn-20151231.xsd#EquipmentFinancingObligationsDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/EquipmentFinancingObligationsDetails1" xlink:href="fsnn-20151231.xsd#EquipmentFinancingObligationsDetails1" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/SupplementalDisclosureOfCashFlowInformationDetails" xlink:href="fsnn-20151231.xsd#SupplementalDisclosureOfCashFlowInformationDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/NotesPayable-Non-relatedPartiesDetails" xlink:href="fsnn-20151231.xsd#NotesPayable-Non-relatedPartiesDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/NotesPayable-RelatedPartyDetails" xlink:href="fsnn-20151231.xsd#NotesPayable-RelatedPartyDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/NotesPayable-RelatedPartyDetailsNarrative" xlink:href="fsnn-20151231.xsd#NotesPayable-RelatedPartyDetailsNarrative" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/EquityTransactionsDetails" xlink:href="fsnn-20151231.xsd#EquityTransactionsDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/EquityTransactionsDetails1" xlink:href="fsnn-20151231.xsd#EquityTransactionsDetails1" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/EquityTransactionsDetailsNarrative" xlink:href="fsnn-20151231.xsd#EquityTransactionsDetailsNarrative" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/DerivativeLiabilityDetails" xlink:href="fsnn-20151231.xsd#DerivativeLiabilityDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/FairValueDisclosuresDetails" xlink:href="fsnn-20151231.xsd#FairValueDisclosuresDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/FairValueDisclosuresDetails1" xlink:href="fsnn-20151231.xsd#FairValueDisclosuresDetails1" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/IncomeTaxesDetails" xlink:href="fsnn-20151231.xsd#IncomeTaxesDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/IncomeTaxesDetails1" xlink:href="fsnn-20151231.xsd#IncomeTaxesDetails1" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/IncomeTaxesDetails2" xlink:href="fsnn-20151231.xsd#IncomeTaxesDetails2" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/IncomeTaxesDetailsNarrative" xlink:href="fsnn-20151231.xsd#IncomeTaxesDetailsNarrative" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/CommitmentsAndContingenciesDetails" xlink:href="fsnn-20151231.xsd#CommitmentsAndContingenciesDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/CommitmentsAndContingenciesDetailsNarrative" xlink:href="fsnn-20151231.xsd#CommitmentsAndContingenciesDetailsNarrative" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/ConcentrationsDetails" xlink:href="fsnn-20151231.xsd#ConcentrationsDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/ConcentrationsDetailsNarrative" xlink:href="fsnn-20151231.xsd#ConcentrationsDetailsNarrative" xlink:type="simple" />
    <link:roleRef roleURI="http://fusiontel.com/role/SegmentInformationDetails" xlink:href="fsnn-20151231.xsd#SegmentInformationDetails" xlink:type="simple" />
    <link:arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension" arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" />
    <link:arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain" arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" />
    <link:arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member" arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" />
    <link:arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all" arcroleURI="http://xbrl.org/int/dim/arcrole/all" />
    <link:arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#notAll" arcroleURI="http://xbrl.org/int/dim/arcrole/notAll" />
    <link:arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default" arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/DocumentAndEntityInformation" xlink:title="00000001 - Document - Document and Entity Information" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/BalanceSheets" xlink:title="00000002 - Statement - Consolidated Balance Sheets" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/BalanceSheetsParenthetical" xlink:title="00000003 - Statement - Consolidated Balance Sheets (Parenthetical)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/StatementsOfOperations" xlink:title="00000004 - Statement - Consolidated Statements Of Operations" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/StatementsOfOperationsParenthetical" xlink:title="00000005 - Statement - Consolidated Statements Of Operations (Parenthetical)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/StatementsOfChangesInStockholdersDeficitUsd" xlink:title="00000006 - Statement - Consolidated Statements of Changes in Stockholders' Deficit (USD $)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" xlink:type="arc" order="10" xbrldt:closed="true" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaapStatementEquityComponentsAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapStatementEquityComponentsAxis" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaapEquityComponentDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapStatementEquityComponentsAxis" xlink:to="loc_us-gaapEquityComponentDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaapEquityComponentDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementEquityComponentsAxis" xlink:to="loc_us-gaapEquityComponentDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PreferredStockMember" xlink:label="loc_us-gaapPreferredStockMember_0" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapEquityComponentDomain" xlink:to="loc_us-gaapPreferredStockMember_0" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonStockMember" xlink:label="loc_us-gaapCommonStockMember_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapEquityComponentDomain" xlink:to="loc_us-gaapCommonStockMember_10" xlink:type="arc" order="11" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AdditionalPaidInCapitalMember" xlink:label="loc_us-gaapAdditionalPaidInCapitalMember_20" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapEquityComponentDomain" xlink:to="loc_us-gaapAdditionalPaidInCapitalMember_20" xlink:type="arc" order="21" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RetainedEarningsMember" xlink:label="loc_us-gaapRetainedEarningsMember_30" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapEquityComponentDomain" xlink:to="loc_us-gaapRetainedEarningsMember_30" xlink:type="arc" order="31" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SharesIssued" xlink:label="loc_us-gaapSharesIssued_60" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapSharesIssued_60" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaapStockholdersEquity_60" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStockholdersEquity_60" xlink:type="arc" order="2" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_ProceedsFromSaleOfPreferredStockAndWarrantsNetOfExpensesShares" xlink:label="loc_FSNNProceedsFromSaleOfPreferredStockAndWarrantsNetOfExpensesShares_60" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNProceedsFromSaleOfPreferredStockAndWarrantsNetOfExpensesShares_60" xlink:type="arc" order="3" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_ProceedsFromSaleOfPreferredStockAndWarrantsNetOfExpensesAmount" xlink:label="loc_FSNNProceedsFromSaleOfPreferredStockAndWarrantsNetOfExpensesAmount_60" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNProceedsFromSaleOfPreferredStockAndWarrantsNetOfExpensesAmount_60" xlink:type="arc" order="4" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_DiscountOnRelatedPartyNotePayableNetOfExchanges" xlink:label="loc_FSNNDiscountOnRelatedPartyNotePayableNetOfExchanges_60" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNDiscountOnRelatedPartyNotePayableNetOfExchanges_60" xlink:type="arc" order="5" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_WarrantsIssuedThatWereDeemedNotIndexedToCompanysCommonStock" xlink:label="loc_FSNNWarrantsIssuedThatWereDeemedNotIndexedToCompanysCommonStock_60" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNWarrantsIssuedThatWereDeemedNotIndexedToCompanysCommonStock_60" xlink:type="arc" order="6" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_IssuanceOfCommonStockForServicesRenderedShares" xlink:label="loc_FSNNIssuanceOfCommonStockForServicesRenderedShares_60" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNIssuanceOfCommonStockForServicesRenderedShares_60" xlink:type="arc" order="7" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_IssuanceOfCommonStockForServicesRenderedAmount" xlink:label="loc_FSNNIssuanceOfCommonStockForServicesRenderedAmount_60" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNIssuanceOfCommonStockForServicesRenderedAmount_60" xlink:type="arc" order="8" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_ModificationOfPreviouslyIssuedWarrantsAndReclassificationToStockholdersEquity" xlink:label="loc_FSNNModificationOfPreviouslyIssuedWarrantsAndReclassificationToStockholdersEquity_60" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNModificationOfPreviouslyIssuedWarrantsAndReclassificationToStockholdersEquity_60" xlink:type="arc" order="9" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_ProceedsFromSaleOfCommonStockAndWarrantsNetOfExpensesShares" xlink:label="loc_FSNNProceedsFromSaleOfCommonStockAndWarrantsNetOfExpensesShares_60" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNProceedsFromSaleOfCommonStockAndWarrantsNetOfExpensesShares_60" xlink:type="arc" order="10" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_ProceedsFromSaleOfCommonStockAndWarrantsNetOfExpensesAmount" xlink:label="loc_FSNNProceedsFromSaleOfCommonStockAndWarrantsNetOfExpensesAmount_60" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNProceedsFromSaleOfCommonStockAndWarrantsNetOfExpensesAmount_60" xlink:type="arc" order="11" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_IssuanceOfWarrantsAssociatedWithConversionOfIndebtednessShares" xlink:label="loc_FSNNIssuanceOfWarrantsAssociatedWithConversionOfIndebtednessShares_60" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNIssuanceOfWarrantsAssociatedWithConversionOfIndebtednessShares_60" xlink:type="arc" order="12" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_IssuanceOfWarrantsAssociatedWithConversionOfIndebtednessAmount" xlink:label="loc_FSNNIssuanceOfWarrantsAssociatedWithConversionOfIndebtednessAmount_60" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNIssuanceOfWarrantsAssociatedWithConversionOfIndebtednessAmount_60" xlink:type="arc" order="13" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_ConversionOfNotesPayableAndAccruedExpensesIntoPreferredStockAndWarrantsShares" xlink:label="loc_FSNNConversionOfNotesPayableAndAccruedExpensesIntoPreferredStockAndWarrantsShares_60" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNConversionOfNotesPayableAndAccruedExpensesIntoPreferredStockAndWarrantsShares_60" xlink:type="arc" order="14" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_ConversionOfNotesPayableAndAccruedExpensesIntoPreferredStockAndWarrantsAmount" xlink:label="loc_FSNNConversionOfNotesPayableAndAccruedExpensesIntoPreferredStockAndWarrantsAmount_60" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNConversionOfNotesPayableAndAccruedExpensesIntoPreferredStockAndWarrantsAmount_60" xlink:type="arc" order="15" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_ConversionOfNotesPayableAndAccruedInterestIntoCommonStockAndWarrantsShares" xlink:label="loc_FSNNConversionOfNotesPayableAndAccruedInterestIntoCommonStockAndWarrantsShares_60" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNConversionOfNotesPayableAndAccruedInterestIntoCommonStockAndWarrantsShares_60" xlink:type="arc" order="16" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_ConversionOfNotesPayableAndAccruedInterestIntoCommonStockAndWarrantsAmount" xlink:label="loc_FSNNConversionOfNotesPayableAndAccruedInterestIntoCommonStockAndWarrantsAmount_60" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNConversionOfNotesPayableAndAccruedInterestIntoCommonStockAndWarrantsAmount_60" xlink:type="arc" order="17" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaapNetIncomeLoss_60" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapNetIncomeLoss_60" xlink:type="arc" order="18" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_ConversionOfPreferredStockIntoCommonStockShares" xlink:label="loc_FSNNConversionOfPreferredStockIntoCommonStockShares_60" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNConversionOfPreferredStockIntoCommonStockShares_60" xlink:type="arc" order="19" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_ConversionOfPreferredStockIntoCommonStockAmount" xlink:label="loc_FSNNConversionOfPreferredStockIntoCommonStockAmount_60" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNConversionOfPreferredStockIntoCommonStockAmount_60" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PreferredStockDividendsShares" xlink:label="loc_us-gaapPreferredStockDividendsShares_60" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapPreferredStockDividendsShares_60" xlink:type="arc" order="21" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DividendsPreferredStock" xlink:label="loc_us-gaapDividendsPreferredStock_60" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapDividendsPreferredStock_60" xlink:type="arc" order="22" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_SharesIssuedAsPartialPurchasePriceOfAcquiredBusinessShares" xlink:label="loc_FSNNSharesIssuedAsPartialPurchasePriceOfAcquiredBusinessShares_60" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNSharesIssuedAsPartialPurchasePriceOfAcquiredBusinessShares_60" xlink:type="arc" order="23" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_SharesIssuedAsPartialPurchasePriceOfAcquiredBusinessAmount" xlink:label="loc_FSNNSharesIssuedAsPartialPurchasePriceOfAcquiredBusinessAmount_60" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNSharesIssuedAsPartialPurchasePriceOfAcquiredBusinessAmount_60" xlink:type="arc" order="24" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_StockBasedCompensationAssociatedWithStockIncentivePlans" xlink:label="loc_FSNNStockBasedCompensationAssociatedWithStockIncentivePlans_60" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNStockBasedCompensationAssociatedWithStockIncentivePlans_60" xlink:type="arc" order="25" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_ConversionOfSeriesB1PreferredStockIntoComonStockShares" xlink:label="loc_FSNNConversionOfSeriesB1PreferredStockIntoComonStockShares_60" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNConversionOfSeriesB1PreferredStockIntoComonStockShares_60" xlink:type="arc" order="26" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_ConversionOfSeriesB1PreferredStockIntoComonStockAmount" xlink:label="loc_FSNNConversionOfSeriesB1PreferredStockIntoComonStockAmount_60" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNConversionOfSeriesB1PreferredStockIntoComonStockAmount_60" xlink:type="arc" order="27" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_IssuanceOfCommonStockInLieuOfCashBonusShares" xlink:label="loc_FSNNIssuanceOfCommonStockInLieuOfCashBonusShares_60" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNIssuanceOfCommonStockInLieuOfCashBonusShares_60" xlink:type="arc" order="28" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_IssuanceOfCommonStockInLieuOfCashBonusAmount" xlink:label="loc_FSNNIssuanceOfCommonStockInLieuOfCashBonusAmount_60" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNIssuanceOfCommonStockInLieuOfCashBonusAmount_60" xlink:type="arc" order="29" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_SettlementOfOutstandingDebtWithCommonStockShares" xlink:label="loc_FSNNSettlementOfOutstandingDebtWithCommonStockShares_60" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNSettlementOfOutstandingDebtWithCommonStockShares_60" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_SettlementOfOutstandingDebtWithCommonStockAmount" xlink:label="loc_FSNNSettlementOfOutstandingDebtWithCommonStockAmount_60" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNSettlementOfOutstandingDebtWithCommonStockAmount_60" xlink:type="arc" order="31" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_ExerciseOfLendersWarrantsShares" xlink:label="loc_FSNNExerciseOfLendersWarrantsShares_60" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNExerciseOfLendersWarrantsShares_60" xlink:type="arc" order="32" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_ExerciseOfLendersWarrantsAmount" xlink:label="loc_FSNNExerciseOfLendersWarrantsAmount_60" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNExerciseOfLendersWarrantsAmount_60" xlink:type="arc" order="33" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_CommonStockIssuedAsPartOfPurchasePriceAcquisitionShares" xlink:label="loc_FSNNCommonStockIssuedAsPartOfPurchasePriceAcquisitionShares_60" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNCommonStockIssuedAsPartOfPurchasePriceAcquisitionShares_60" xlink:type="arc" order="34" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_CommonStockIssuedAsPartOfPurchasePriceFidelityAmount" xlink:label="loc_FSNNCommonStockIssuedAsPartOfPurchasePriceFidelityAmount_60" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNCommonStockIssuedAsPartOfPurchasePriceFidelityAmount_60" xlink:type="arc" order="35" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_AjustmentForFractionalSharesIssuedInReverseStockSplitShares" xlink:label="loc_FSNNAjustmentForFractionalSharesIssuedInReverseStockSplitShares_60" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNAjustmentForFractionalSharesIssuedInReverseStockSplitShares_60" xlink:type="arc" order="36" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_AjustmentForFractionalSharesIssuedInReverseStockSplitAmount" xlink:label="loc_FSNNAjustmentForFractionalSharesIssuedInReverseStockSplitAmount_60" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNAjustmentForFractionalSharesIssuedInReverseStockSplitAmount_60" xlink:type="arc" order="37" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/InterimStatementsOfCashFlows" xlink:title="00000007 - Statement - Condensed Consolidated Interim Statements of Cash Flows" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/InterimStatementsOfCashFlowsParenthetical" xlink:title="00000008 - Statement - Condensed Consolidated Interim Statements of Cash Flows (Parenthetical)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/NatureOfOperations" xlink:title="00000009 - Disclosure - 1. Nature Of Operations" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/SignificantAccountingPolicies" xlink:title="00000010 - Disclosure - 2. Significant Accounting Policies" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/LossPerShare" xlink:title="00000011 - Disclosure - 3. Loss per Share" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/Stock-basedCompensation" xlink:title="00000012 - Disclosure - 4. Stock-Based Compensation" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/Acquisition" xlink:title="00000013 - Disclosure - 5. Acquisition" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/IntangibleAssets" xlink:title="00000014 - Disclosure - 6. Intangible Assets" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/PrepaidExpensesAndOtherCurrentAssets" xlink:title="00000015 - Disclosure - 7. Prepaid Expenses and Other Current Assets" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/AccountsPayableAndAccruedExpenses" xlink:title="00000016 - Disclosure - 8. Accounts Payable and Accrued Expenses" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/PropertyAndEquipment" xlink:title="00000017 - Disclosure - 9. Property And Equipment" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/EquipmentFinancingObligations" xlink:title="00000018 - Disclosure - 10. Equipment Financing Obligations" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/SupplementalDisclosureOfCashFlowInformation" xlink:title="00000019 - Disclosure - 11. Supplemental Disclosure of Cash Flow Information" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/DueToRootaxcessSeller" xlink:title="00000020 - Disclosure - 12. Due to RootAxcess Seller" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/SecuredCreditFacility" xlink:title="00000021 - Disclosure - 13. Secured Credit Facility" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/NotesPayable-non-relatedParties" xlink:title="00000022 - Disclosure - 14. Notes Payable-Non-Related Parties" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/NotesPayable-relatedParties" xlink:title="00000023 - Disclosure - 15. Notes Payable-Related Parties" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/EquityTransactions" xlink:title="00000024 - Disclosure - 16. Equity Transactions" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/DerivativeLiability" xlink:title="00000025 - Disclosure - 17. Derivative Liability" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/FairValueDisclosures" xlink:title="00000026 - Disclosure - 18. Fair Value Disclosures" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/IncomeTaxes" xlink:title="00000027 - Disclosure - 19. Income Taxes" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/CommitmentsAndContingencies" xlink:title="00000028 - Disclosure - 20. Commitments and Contingencies" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/ProfitSharingPlan" xlink:title="00000029 - Disclosure - 21. Profit Sharing Plan" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/Concentrations" xlink:title="00000030 - Disclosure - 22. Concentrations" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/SegmentInformation" xlink:title="00000031 - Disclosure - 23. Segment Information" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/RelatedPartyTransactions" xlink:title="00000032 - Disclosure - 24. Related Party Transactions" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/SubsequentEvents" xlink:title="00000033 - Disclosure - 25. Subsequent Events" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/SignificantAccountingPoliciesPolicies" xlink:title="00000034 - Disclosure - 2. Significant Accounting Policies (Policies)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/SignificantAccountingPoliciesTables" xlink:title="00000035 - Disclosure - 2. Significant Accounting Policies (Tables)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/LossPerShareTables" xlink:title="00000036 - Disclosure - 3. Loss per Share (Tables)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/Stock-basedCompensationTables" xlink:title="00000037 - Disclosure - 4. Stock-Based Compensation (Tables)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/AcquisitionsTables" xlink:title="00000038 - Disclosure - 5. Acquisitions (Tables)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/IntangibleAssetsTables" xlink:title="00000039 - Disclosure - 6. Intangible Assets (Tables)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/PrepaidExpensesAndOtherCurrentAssetsTables" xlink:title="00000040 - Disclosure - 7. Prepaid Expenses and Other Current Assets (Tables)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/AccountsPayableAndAccruedExpensesTables" xlink:title="00000041 - Disclosure - 8. Accounts Payable and Accrued Expenses (Tables)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/PropertyAndEquipmentTables" xlink:title="00000042 - Disclosure - 9. Property and Equipment (Tables)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/EquipmentFinancingObligationsTables" xlink:title="00000043 - Disclosure - 10. Equipment Financing Obligations (Tables)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/SupplementalDisclosureOfCashFlowInformationTables" xlink:title="00000044 - Disclosure - 11. Supplemental Disclosure of Cash Flow Information (Tables)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/NotesPayableNon-relatedPartiesTables" xlink:title="00000045 - Disclosure - 14. Notes Payable Non-Related Parties (Tables)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/NotesPayableRelatedPartiesTables" xlink:title="00000046 - Disclosure - 15. Notes Payable Related Parties (Tables)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/EquityTransactionsTables" xlink:title="00000047 - Disclosure - 16. Equity Transactions (Tables)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/DerivativeLiabilityTables" xlink:title="00000048 - Disclosure - 17. Derivative Liability (Tables)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/FairValueDisclosuresTables" xlink:title="00000049 - Disclosure - 18. Fair Value Disclosures (Tables)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/IncomeTaxesTables" xlink:title="00000050 - Disclosure - 19. Income Taxes (Tables)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/CommitmentsAndContingenciesTables" xlink:title="00000051 - Disclosure - 20. Commitments and Contingencies (Tables)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/ConcentrationsTables" xlink:title="00000052 - Disclosure - 22. Concentrations (Tables)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/SegmentInformationTables" xlink:title="00000053 - Disclosure - 23. Segment Information (Tables)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/SignificantAccountingPoliciesDetails" xlink:title="00000054 - Disclosure - 2. Significant Accounting Policies (Details)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/SignificantAccountingPoliciesDetails1" xlink:title="00000055 - Disclosure - 2. Significant Accounting Policies (Details 1)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/SignificantAccountingPoliciesDetails2" xlink:title="00000056 - Disclosure - 2. Significant Accounting Policies (Details 2)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/SignificantAccountingPoliciesDetails3" xlink:title="00000057 - Disclosure - 2. Significant Accounting Policies (Details 3)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" xlink:type="arc" order="10" xbrldt:closed="true" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="loc_us-gaapPropertyPlantAndEquipmentByTypeAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapPropertyPlantAndEquipmentByTypeAxis" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaapPropertyPlantAndEquipmentTypeDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapPropertyPlantAndEquipmentByTypeAxis" xlink:to="loc_us-gaapPropertyPlantAndEquipmentTypeDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaapPropertyPlantAndEquipmentTypeDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapPropertyPlantAndEquipmentByTypeAxis" xlink:to="loc_us-gaapPropertyPlantAndEquipmentTypeDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_NetworkEquipmentMember" xlink:label="loc_FSNNNetworkEquipmentMember_0" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapPropertyPlantAndEquipmentTypeDomain" xlink:to="loc_FSNNNetworkEquipmentMember_0" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FurnitureAndFixturesMember" xlink:label="loc_us-gaapFurnitureAndFixturesMember_20" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapPropertyPlantAndEquipmentTypeDomain" xlink:to="loc_us-gaapFurnitureAndFixturesMember_20" xlink:type="arc" order="21" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ComputerEquipmentMember" xlink:label="loc_us-gaapComputerEquipmentMember_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapPropertyPlantAndEquipmentTypeDomain" xlink:to="loc_us-gaapComputerEquipmentMember_40" xlink:type="arc" order="41" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_CustomerPremiseEquipmentMember" xlink:label="loc_FSNNCustomerPremiseEquipmentMember_60" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapPropertyPlantAndEquipmentTypeDomain" xlink:to="loc_FSNNCustomerPremiseEquipmentMember_60" xlink:type="arc" order="61" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaapRangeAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapRangeAxis" xlink:type="arc" order="2" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaapRangeMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapRangeAxis" xlink:to="loc_us-gaapRangeMember" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaapRangeMember_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapRangeAxis" xlink:to="loc_us-gaapRangeMember_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MinimumMember" xlink:label="loc_us-gaapMinimumMember_0" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapRangeMember" xlink:to="loc_us-gaapMinimumMember_0" xlink:type="arc" order="2" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaapMaximumMember_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapRangeMember" xlink:to="loc_us-gaapMaximumMember_10" xlink:type="arc" order="12" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife" xlink:label="loc_us-gaapPropertyPlantAndEquipmentUsefulLife_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapPropertyPlantAndEquipmentUsefulLife_90" xlink:type="arc" order="0" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/SignificantAccountingPoliciesDetails4" xlink:title="00000058 - Disclosure - 2. Significant Accounting Policies (Details 4)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems" xlink:label="loc_us-gaapAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable" xlink:label="loc_us-gaapScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems" xlink:to="loc_us-gaapScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable" xlink:type="arc" order="10" xbrldt:closed="true" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis" xlink:label="loc_us-gaapAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable" xlink:to="loc_us-gaapAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain" xlink:label="loc_us-gaapAntidilutiveSecuritiesNameDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis" xlink:to="loc_us-gaapAntidilutiveSecuritiesNameDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain" xlink:label="loc_us-gaapAntidilutiveSecuritiesNameDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis" xlink:to="loc_us-gaapAntidilutiveSecuritiesNameDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_WarrantMember" xlink:label="loc_us-gaapWarrantMember_0" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapAntidilutiveSecuritiesNameDomain" xlink:to="loc_us-gaapWarrantMember_0" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_StockOptions1Member" xlink:label="loc_FSNNStockOptions1Member_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapAntidilutiveSecuritiesNameDomain" xlink:to="loc_FSNNStockOptions1Member_10" xlink:type="arc" order="11" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ConvertibleDebtSecuritiesMember" xlink:label="loc_us-gaapConvertibleDebtSecuritiesMember_20" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapAntidilutiveSecuritiesNameDomain" xlink:to="loc_us-gaapConvertibleDebtSecuritiesMember_20" xlink:type="arc" order="21" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_AntidilutiveSecurities" xlink:label="loc_FSNNAntidilutiveSecurities_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems" xlink:to="loc_FSNNAntidilutiveSecurities_90" xlink:type="arc" order="1" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/SignificantAccountingPoliciesDetails5" xlink:title="00000059 - Disclosure - 2. Significant Accounting Policies (Details 5)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/SignificantAccountingPoliciesDetailsNarrative" xlink:title="00000060 - Disclosure - 2. Significant Accounting Policies (Details Narrative )" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/LossPerShareDetails" xlink:title="00000061 - Disclosure - 3. Loss Per Share (Details)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/LossPerShareDetails1" xlink:title="00000062 - Disclosure - 3. Loss Per Share (Details 1)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" xlink:type="arc" order="10" xbrldt:closed="true" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis" xlink:label="loc_us-gaapAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain" xlink:label="loc_us-gaapAntidilutiveSecuritiesNameDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis" xlink:to="loc_us-gaapAntidilutiveSecuritiesNameDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain" xlink:label="loc_us-gaapAntidilutiveSecuritiesNameDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis" xlink:to="loc_us-gaapAntidilutiveSecuritiesNameDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_WarrantMember" xlink:label="loc_us-gaapWarrantMember_0" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapAntidilutiveSecuritiesNameDomain" xlink:to="loc_us-gaapWarrantMember_0" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ConvertiblePreferredStockMember" xlink:label="loc_us-gaapConvertiblePreferredStockMember_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapAntidilutiveSecuritiesNameDomain" xlink:to="loc_us-gaapConvertiblePreferredStockMember_10" xlink:type="arc" order="11" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StockOptionMember" xlink:label="loc_us-gaapStockOptionMember_20" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapAntidilutiveSecuritiesNameDomain" xlink:to="loc_us-gaapStockOptionMember_20" xlink:type="arc" order="21" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" xlink:label="loc_us-gaapAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_90" xlink:type="arc" order="0" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/Stock-basedCompensationDetails" xlink:title="00000063 - Disclosure - 4. Stock-Based Compensation (Details)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/Stock-basedCompensationDetails1" xlink:title="00000064 - Disclosure - 4. Stock-Based Compensation (Details 1)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/Stock-basedCompensationDetails2" xlink:title="00000065 - Disclosure - 4. Stock-Based Compensation (Details 2)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" xlink:type="arc" order="10" xbrldt:closed="true" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OptionIndexedToIssuersEquityTypeAxis" xlink:label="loc_us-gaapOptionIndexedToIssuersEquityTypeAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapOptionIndexedToIssuersEquityTypeAxis" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OptionIndexedToIssuersEquityTypeDomain" xlink:label="loc_us-gaapOptionIndexedToIssuersEquityTypeDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapOptionIndexedToIssuersEquityTypeAxis" xlink:to="loc_us-gaapOptionIndexedToIssuersEquityTypeDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OptionIndexedToIssuersEquityTypeDomain" xlink:label="loc_us-gaapOptionIndexedToIssuersEquityTypeDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapOptionIndexedToIssuersEquityTypeAxis" xlink:to="loc_us-gaapOptionIndexedToIssuersEquityTypeDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_Option1Member" xlink:label="loc_FSNNOption1Member_0" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapOptionIndexedToIssuersEquityTypeDomain" xlink:to="loc_FSNNOption1Member_0" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_Option2Member" xlink:label="loc_FSNNOption2Member_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapOptionIndexedToIssuersEquityTypeDomain" xlink:to="loc_FSNNOption2Member_10" xlink:type="arc" order="11" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_Option3Member" xlink:label="loc_FSNNOption3Member_20" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapOptionIndexedToIssuersEquityTypeDomain" xlink:to="loc_FSNNOption3Member_20" xlink:type="arc" order="21" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_Option4Member" xlink:label="loc_FSNNOption4Member_30" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapOptionIndexedToIssuersEquityTypeDomain" xlink:to="loc_FSNNOption4Member_30" xlink:type="arc" order="31" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_Option5Member" xlink:label="loc_FSNNOption5Member_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapOptionIndexedToIssuersEquityTypeDomain" xlink:to="loc_FSNNOption5Member_40" xlink:type="arc" order="41" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_Option6Member" xlink:label="loc_FSNNOption6Member_50" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapOptionIndexedToIssuersEquityTypeDomain" xlink:to="loc_FSNNOption6Member_50" xlink:type="arc" order="51" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_Option7Member" xlink:label="loc_FSNNOption7Member_60" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapOptionIndexedToIssuersEquityTypeDomain" xlink:to="loc_FSNNOption7Member_60" xlink:type="arc" order="61" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_OptionsOutstanding" xlink:label="loc_FSNNOptionsOutstanding_100" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNOptionsOutstanding_100" xlink:type="arc" order="0" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2" xlink:label="loc_us-gaapSharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_100" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapSharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_100" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_WeightedAveragePrice" xlink:label="loc_FSNNWeightedAveragePrice_100" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNWeightedAveragePrice_100" xlink:type="arc" order="2" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue" xlink:label="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue_100" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue_100" xlink:type="arc" order="3" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_OptionsExercisable" xlink:label="loc_FSNNOptionsExercisable_100" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNOptionsExercisable_100" xlink:type="arc" order="4" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1" xlink:label="loc_us-gaapSharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_100" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapSharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_100" xlink:type="arc" order="5" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_OptionExercisableWeightedAveragePrice" xlink:label="loc_FSNNOptionExercisableWeightedAveragePrice_100" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNOptionExercisableWeightedAveragePrice_100" xlink:type="arc" order="6" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue" xlink:label="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue_100" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue_100" xlink:type="arc" order="7" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/AcquisitionDetails" xlink:title="00000066 - Disclosure - 5. Acquisition (Details)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" xlink:type="arc" order="10" xbrldt:closed="true" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaapBusinessAcquisitionAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapBusinessAcquisitionAxis" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaapBusinessAcquisitionAcquireeDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapBusinessAcquisitionAxis" xlink:to="loc_us-gaapBusinessAcquisitionAcquireeDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaapBusinessAcquisitionAcquireeDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapBusinessAcquisitionAxis" xlink:to="loc_us-gaapBusinessAcquisitionAcquireeDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_FidelityMember" xlink:label="loc_FSNNFidelityMember_0" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionAcquireeDomain" xlink:to="loc_FSNNFidelityMember_0" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_RootAxcessMember" xlink:label="loc_FSNNRootAxcessMember_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionAcquireeDomain" xlink:to="loc_FSNNRootAxcessMember_10" xlink:type="arc" order="11" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_PingToneMember" xlink:label="loc_FSNNPingToneMember_20" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionAcquireeDomain" xlink:to="loc_FSNNPingToneMember_20" xlink:type="arc" order="21" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPurchasePrice" xlink:label="loc_FSNNBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPurchasePrice_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPurchasePrice_40" xlink:type="arc" order="0" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents" xlink:label="loc_us-gaapBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_40" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables" xlink:label="loc_us-gaapBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_40" xlink:type="arc" order="2" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities" xlink:label="loc_us-gaapBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_40" xlink:type="arc" order="3" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory" xlink:label="loc_us-gaapBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_40" xlink:type="arc" order="4" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther" xlink:label="loc_us-gaapBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther_40" xlink:type="arc" order="5" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment" xlink:label="loc_us-gaapBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_40" xlink:type="arc" order="6" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCovenantNotToCompete" xlink:label="loc_FSNNBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCovenantNotToCompete_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCovenantNotToCompete_40" xlink:type="arc" order="7" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCustomerContracts" xlink:label="loc_FSNNBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCustomerContracts_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCustomerContracts_40" xlink:type="arc" order="8" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets" xlink:label="loc_us-gaapBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_40" xlink:type="arc" order="9" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsCurrent" xlink:label="loc_us-gaapBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsCurrent_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsCurrent_40" xlink:type="arc" order="10" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill" xlink:label="loc_us-gaapBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_40" xlink:type="arc" order="11" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_BusinessCombinationGoodwillAcquired" xlink:label="loc_FSNNBusinessCombinationGoodwillAcquired_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNBusinessCombinationGoodwillAcquired_40" xlink:type="arc" order="12" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedLiabilities" xlink:label="loc_FSNNBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedLiabilities_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedLiabilities_40" xlink:type="arc" order="13" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_BusinessCombinationCurrentLiabilitiesIncludingWorkingCapitalAdjustments" xlink:label="loc_FSNNBusinessCombinationCurrentLiabilitiesIncludingWorkingCapitalAdjustments_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNBusinessCombinationCurrentLiabilitiesIncludingWorkingCapitalAdjustments_40" xlink:type="arc" order="14" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredTaxLiabilities" xlink:label="loc_us-gaapDeferredTaxLiabilities_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapDeferredTaxLiabilities_40" xlink:type="arc" order="15" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherLiabilities" xlink:label="loc_us-gaapOtherLiabilities_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapOtherLiabilities_40" xlink:type="arc" order="16" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet" xlink:label="loc_us-gaapBusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapBusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_40" xlink:type="arc" order="17" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/AcquisitionDetails1" xlink:title="00000067 - Disclosure - 5. Acquisition (Details 1)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" xlink:type="arc" order="10" xbrldt:closed="true" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaapBusinessAcquisitionAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapBusinessAcquisitionAxis" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaapBusinessAcquisitionAcquireeDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapBusinessAcquisitionAxis" xlink:to="loc_us-gaapBusinessAcquisitionAcquireeDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaapBusinessAcquisitionAcquireeDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapBusinessAcquisitionAxis" xlink:to="loc_us-gaapBusinessAcquisitionAcquireeDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_FidelityMember" xlink:label="loc_FSNNFidelityMember_0" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionAcquireeDomain" xlink:to="loc_FSNNFidelityMember_0" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_PingToneMember" xlink:label="loc_FSNNPingToneMember_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionAcquireeDomain" xlink:to="loc_FSNNPingToneMember_10" xlink:type="arc" order="11" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionsProFormaRevenue" xlink:label="loc_us-gaapBusinessAcquisitionsProFormaRevenue_30" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapBusinessAcquisitionsProFormaRevenue_30" xlink:type="arc" order="0" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss" xlink:label="loc_us-gaapBusinessAcquisitionsProFormaNetIncomeLoss_30" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapBusinessAcquisitionsProFormaNetIncomeLoss_30" xlink:type="arc" order="1" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/AcquisitionDetailsNarrative" xlink:title="00000068 - Disclosure - 5. Acquisition (Details Narrative )" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/IntangibleAssetsDetails" xlink:title="00000069 - Disclosure - 6. Intangible Assets (Details)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfIndefiniteLivedIntangibleAssetsTable" xlink:label="loc_us-gaapScheduleOfIndefiniteLivedIntangibleAssetsTable" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapScheduleOfIndefiniteLivedIntangibleAssetsTable" xlink:type="arc" order="10" xbrldt:closed="true" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaapBusinessAcquisitionAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfIndefiniteLivedIntangibleAssetsTable" xlink:to="loc_us-gaapBusinessAcquisitionAxis" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaapBusinessAcquisitionAcquireeDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapBusinessAcquisitionAxis" xlink:to="loc_us-gaapBusinessAcquisitionAcquireeDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaapBusinessAcquisitionAcquireeDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapBusinessAcquisitionAxis" xlink:to="loc_us-gaapBusinessAcquisitionAcquireeDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_SubsidiaryOneMember" xlink:label="loc_FSNNSubsidiaryOneMember_0" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionAcquireeDomain" xlink:to="loc_FSNNSubsidiaryOneMember_0" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="loc_us-gaapPropertyPlantAndEquipmentByTypeAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfIndefiniteLivedIntangibleAssetsTable" xlink:to="loc_us-gaapPropertyPlantAndEquipmentByTypeAxis" xlink:type="arc" order="2" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaapPropertyPlantAndEquipmentTypeDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapPropertyPlantAndEquipmentByTypeAxis" xlink:to="loc_us-gaapPropertyPlantAndEquipmentTypeDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaapPropertyPlantAndEquipmentTypeDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapPropertyPlantAndEquipmentByTypeAxis" xlink:to="loc_us-gaapPropertyPlantAndEquipmentTypeDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_TrademarksAndTradenameMember" xlink:label="loc_FSNNTrademarksAndTradenameMember_0" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapPropertyPlantAndEquipmentTypeDomain" xlink:to="loc_FSNNTrademarksAndTradenameMember_0" xlink:type="arc" order="2" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_ProprietaryTechnologyMember" xlink:label="loc_FSNNProprietaryTechnologyMember_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapPropertyPlantAndEquipmentTypeDomain" xlink:to="loc_FSNNProprietaryTechnologyMember_10" xlink:type="arc" order="12" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_NonCompeteAgreementMember" xlink:label="loc_FSNNNonCompeteAgreementMember_20" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapPropertyPlantAndEquipmentTypeDomain" xlink:to="loc_FSNNNonCompeteAgreementMember_20" xlink:type="arc" order="22" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CustomerContractsMember" xlink:label="loc_us-gaapCustomerContractsMember_30" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapPropertyPlantAndEquipmentTypeDomain" xlink:to="loc_us-gaapCustomerContractsMember_30" xlink:type="arc" order="32" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_FavorableLeaseIntangibleMember" xlink:label="loc_FSNNFavorableLeaseIntangibleMember_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapPropertyPlantAndEquipmentTypeDomain" xlink:to="loc_FSNNFavorableLeaseIntangibleMember_40" xlink:type="arc" order="42" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_TotalAcquiredIntangiblesMember" xlink:label="loc_FSNNTotalAcquiredIntangiblesMember_50" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapPropertyPlantAndEquipmentTypeDomain" xlink:to="loc_FSNNTotalAcquiredIntangiblesMember_50" xlink:type="arc" order="52" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaapIndefiniteLivedIntangibleAssetsByMajorClassAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfIndefiniteLivedIntangibleAssetsTable" xlink:to="loc_us-gaapIndefiniteLivedIntangibleAssetsByMajorClassAxis" xlink:type="arc" order="3" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaapIndefiniteLivedIntangibleAssetsMajorClassNameDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapIndefiniteLivedIntangibleAssetsByMajorClassAxis" xlink:to="loc_us-gaapIndefiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaapIndefiniteLivedIntangibleAssetsMajorClassNameDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapIndefiniteLivedIntangibleAssetsByMajorClassAxis" xlink:to="loc_us-gaapIndefiniteLivedIntangibleAssetsMajorClassNameDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsGross" xlink:label="loc_us-gaapFiniteLivedIntangibleAssetsGross_130" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapFiniteLivedIntangibleAssetsGross_130" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:label="loc_us-gaapFiniteLivedIntangibleAssetsAccumulatedAmortization_130" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapFiniteLivedIntangibleAssetsAccumulatedAmortization_130" xlink:type="arc" order="2" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet" xlink:label="loc_us-gaapFiniteLivedIntangibleAssetsNet_130" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapFiniteLivedIntangibleAssetsNet_130" xlink:type="arc" order="3" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/IntangibleAssetsDetails1" xlink:title="00000070 - Disclosure - 6. Intangible Assets (Details 1)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/PrepaidExpensesAndOtherCurrentAssetsDetails" xlink:title="00000071 - Disclosure - 7. Prepaid Expenses and Other Current Assets (Details)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/AccountsPayableAndAccruedExpensesDetails" xlink:title="00000072 - Disclosure - 8. Accounts Payable and Accrued Expenses (Details)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/PropertyAndEquipmentDetails" xlink:title="00000073 - Disclosure - 9. Property and Equipment (Details)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" xlink:type="arc" order="10" xbrldt:closed="true" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="loc_us-gaapPropertyPlantAndEquipmentByTypeAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapPropertyPlantAndEquipmentByTypeAxis" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaapPropertyPlantAndEquipmentTypeDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapPropertyPlantAndEquipmentByTypeAxis" xlink:to="loc_us-gaapPropertyPlantAndEquipmentTypeDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaapPropertyPlantAndEquipmentTypeDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapPropertyPlantAndEquipmentByTypeAxis" xlink:to="loc_us-gaapPropertyPlantAndEquipmentTypeDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_NetworkEquipmentMember" xlink:label="loc_FSNNNetworkEquipmentMember_0" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapPropertyPlantAndEquipmentTypeDomain" xlink:to="loc_FSNNNetworkEquipmentMember_0" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FurnitureAndFixturesMember" xlink:label="loc_us-gaapFurnitureAndFixturesMember_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapPropertyPlantAndEquipmentTypeDomain" xlink:to="loc_us-gaapFurnitureAndFixturesMember_10" xlink:type="arc" order="11" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ComputerEquipmentMember" xlink:label="loc_us-gaapComputerEquipmentMember_20" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapPropertyPlantAndEquipmentTypeDomain" xlink:to="loc_us-gaapComputerEquipmentMember_20" xlink:type="arc" order="21" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_CustomerPremiseEquipmentMember" xlink:label="loc_FSNNCustomerPremiseEquipmentMember_30" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapPropertyPlantAndEquipmentTypeDomain" xlink:to="loc_FSNNCustomerPremiseEquipmentMember_30" xlink:type="arc" order="31" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_VehiclesMember" xlink:label="loc_us-gaapVehiclesMember_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapPropertyPlantAndEquipmentTypeDomain" xlink:to="loc_us-gaapVehiclesMember_40" xlink:type="arc" order="41" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LeaseholdImprovementsMember" xlink:label="loc_us-gaapLeaseholdImprovementsMember_50" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapPropertyPlantAndEquipmentTypeDomain" xlink:to="loc_us-gaapLeaseholdImprovementsMember_50" xlink:type="arc" order="51" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AssetUnderConstructionMember" xlink:label="loc_us-gaapAssetUnderConstructionMember_60" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapPropertyPlantAndEquipmentTypeDomain" xlink:to="loc_us-gaapAssetUnderConstructionMember_60" xlink:type="arc" order="61" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentGross" xlink:label="loc_us-gaapPropertyPlantAndEquipmentGross_170" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapPropertyPlantAndEquipmentGross_170" xlink:type="arc" order="0" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment" xlink:label="loc_us-gaapAccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_170" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapAccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_170" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaapPropertyPlantAndEquipmentNet_170" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapPropertyPlantAndEquipmentNet_170" xlink:type="arc" order="2" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/PropertyAndEquipmentDetailsNarrative" xlink:title="00000074 - Disclosure - 9. Property and Equipment (Details Narrative)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/EquipmentFinancingObligationsDetails" xlink:title="00000075 - Disclosure - 10. Equipment Financing Obligations (Details)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/EquipmentFinancingObligationsDetails1" xlink:title="00000076 - Disclosure - 10. Equipment Financing Obligations (Details 1)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/SupplementalDisclosureOfCashFlowInformationDetails" xlink:title="00000077 - Disclosure - 11. Supplemental Disclosure of Cash Flow Information (Details)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/NotesPayable-Non-relatedPartiesDetails" xlink:title="00000078 - Disclosure - 14. Notes Payable - Non-Related Parties (Details)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" xlink:type="arc" order="10" xbrldt:closed="true" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:label="loc_us-gaapRelatedPartyTransactionsByRelatedPartyAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapRelatedPartyTransactionsByRelatedPartyAxis" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="loc_us-gaapRelatedPartyDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapRelatedPartyTransactionsByRelatedPartyAxis" xlink:to="loc_us-gaapRelatedPartyDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="loc_us-gaapRelatedPartyDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapRelatedPartyTransactionsByRelatedPartyAxis" xlink:to="loc_us-gaapRelatedPartyDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_NonRelatedPartyMember" xlink:label="loc_FSNNNonRelatedPartyMember_0" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapRelatedPartyDomain" xlink:to="loc_FSNNNonRelatedPartyMember_0" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SeniorNotes" xlink:label="loc_us-gaapSeniorNotes_30" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapSeniorNotes_30" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_NotesReduction2" xlink:label="loc_FSNNNotesReduction2_30" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNNotesReduction2_30" xlink:type="arc" order="2" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherLongTermNotesPayable" xlink:label="loc_us-gaapOtherLongTermNotesPayable_30" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapOtherLongTermNotesPayable_30" xlink:type="arc" order="3" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_TotalNotesPayableNonrelatedParties" xlink:label="loc_FSNNTotalNotesPayableNonrelatedParties_30" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNTotalNotesPayableNonrelatedParties_30" xlink:type="arc" order="4" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NotesPayableCurrent" xlink:label="loc_us-gaapNotesPayableCurrent_30" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapNotesPayableCurrent_30" xlink:type="arc" order="5" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherNotesPayableCurrent" xlink:label="loc_us-gaapOtherNotesPayableCurrent_30" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapOtherNotesPayableCurrent_30" xlink:type="arc" order="6" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LongTermNotesPayable" xlink:label="loc_us-gaapLongTermNotesPayable_30" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapLongTermNotesPayable_30" xlink:type="arc" order="7" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/NotesPayable-RelatedPartyDetails" xlink:title="00000079 - Disclosure - 15. Notes Payable - Related Party (Details)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" xlink:type="arc" order="10" xbrldt:closed="true" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:label="loc_us-gaapRelatedPartyTransactionsByRelatedPartyAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapRelatedPartyTransactionsByRelatedPartyAxis" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="loc_us-gaapRelatedPartyDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapRelatedPartyTransactionsByRelatedPartyAxis" xlink:to="loc_us-gaapRelatedPartyDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="loc_us-gaapRelatedPartyDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapRelatedPartyTransactionsByRelatedPartyAxis" xlink:to="loc_us-gaapRelatedPartyDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_RelatedPartyMember" xlink:label="loc_FSNNRelatedPartyMember_0" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapRelatedPartyDomain" xlink:to="loc_FSNNRelatedPartyMember_0" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_NbsSellersNotes" xlink:label="loc_FSNNNbsSellersNotes_30" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNNbsSellersNotes_30" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_NotesPayableToMarvinRosen" xlink:label="loc_FSNNNotesPayableToMarvinRosen_30" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNNotesPayableToMarvinRosen_30" xlink:type="arc" order="2" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_DiscountOnNotesPayableToMarvinRosen" xlink:label="loc_FSNNDiscountOnNotesPayableToMarvinRosen_30" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNDiscountOnNotesPayableToMarvinRosen_30" xlink:type="arc" order="3" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherNotesPayable" xlink:label="loc_us-gaapOtherNotesPayable_30" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapOtherNotesPayable_30" xlink:type="arc" order="4" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent" xlink:label="loc_us-gaapNotesPayableRelatedPartiesCurrentAndNoncurrent_30" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapNotesPayableRelatedPartiesCurrentAndNoncurrent_30" xlink:type="arc" order="5" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_CurrentPortionOfNbsSellersNotes" xlink:label="loc_FSNNCurrentPortionOfNbsSellersNotes_30" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNCurrentPortionOfNbsSellersNotes_30" xlink:type="arc" order="6" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_CurrentPortionOfNotesPayableToMarvinRosen" xlink:label="loc_FSNNCurrentPortionOfNotesPayableToMarvinRosen_30" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNCurrentPortionOfNotesPayableToMarvinRosen_30" xlink:type="arc" order="7" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_OtherNotesPayableRelatedParty" xlink:label="loc_FSNNOtherNotesPayableRelatedParty_30" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNOtherNotesPayableRelatedParty_30" xlink:type="arc" order="8" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_NotesPayableRelatedParties" xlink:label="loc_FSNNNotesPayableRelatedParties_30" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNNotesPayableRelatedParties_30" xlink:type="arc" order="9" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/NotesPayable-RelatedPartyDetailsNarrative" xlink:title="00000080 - Disclosure - 15. Notes Payable - Related Party (Details Narrative)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/EquityTransactionsDetails" xlink:title="00000081 - Disclosure - 16. Equity Transactions (Details)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" xlink:type="arc" order="10" xbrldt:closed="true" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaapStatementEquityComponentsAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapStatementEquityComponentsAxis" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaapEquityComponentDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapStatementEquityComponentsAxis" xlink:to="loc_us-gaapEquityComponentDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaapEquityComponentDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementEquityComponentsAxis" xlink:to="loc_us-gaapEquityComponentDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SeriesAPreferredStockMember" xlink:label="loc_us-gaapSeriesAPreferredStockMember_0" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapEquityComponentDomain" xlink:to="loc_us-gaapSeriesAPreferredStockMember_0" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_SeriesA2PreferredStockMember" xlink:label="loc_FSNNSeriesA2PreferredStockMember_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapEquityComponentDomain" xlink:to="loc_FSNNSeriesA2PreferredStockMember_10" xlink:type="arc" order="11" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_SeriesA4PreferredStockMember" xlink:label="loc_FSNNSeriesA4PreferredStockMember_20" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapEquityComponentDomain" xlink:to="loc_FSNNSeriesA4PreferredStockMember_20" xlink:type="arc" order="21" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_SeriesB2PreferredStockMember" xlink:label="loc_FSNNSeriesB2PreferredStockMember_30" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapEquityComponentDomain" xlink:to="loc_FSNNSeriesB2PreferredStockMember_30" xlink:type="arc" order="31" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonStockOtherSharesOutstanding" xlink:label="loc_us-gaapCommonStockOtherSharesOutstanding_60" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapCommonStockOtherSharesOutstanding_60" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonStockOtherValueOutstanding" xlink:label="loc_us-gaapCommonStockOtherValueOutstanding_60" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapCommonStockOtherValueOutstanding_60" xlink:type="arc" order="2" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_ConversionOfNotesPayableShares" xlink:label="loc_FSNNConversionOfNotesPayableShares_60" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNConversionOfNotesPayableShares_60" xlink:type="arc" order="3" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_ConversionOfNotesPayableAmount" xlink:label="loc_FSNNConversionOfNotesPayableAmount_60" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNConversionOfNotesPayableAmount_60" xlink:type="arc" order="4" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits" xlink:label="loc_us-gaapStockIssuedDuringPeriodSharesConversionOfUnits_60" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStockIssuedDuringPeriodSharesConversionOfUnits_60" xlink:type="arc" order="5" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueConversionOfUnits" xlink:label="loc_us-gaapStockIssuedDuringPeriodValueConversionOfUnits_60" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStockIssuedDuringPeriodValueConversionOfUnits_60" xlink:type="arc" order="6" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:label="loc_us-gaapStockIssuedDuringPeriodSharesNewIssues_60" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStockIssuedDuringPeriodSharesNewIssues_60" xlink:type="arc" order="7" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueNewIssues" xlink:label="loc_us-gaapStockIssuedDuringPeriodValueNewIssues_60" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStockIssuedDuringPeriodValueNewIssues_60" xlink:type="arc" order="8" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/EquityTransactionsDetails1" xlink:title="00000082 - Disclosure - 16. Equity Transactions (Details 1)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" xlink:type="arc" order="10" xbrldt:closed="true" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaapRangeAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapRangeAxis" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaapRangeMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapRangeAxis" xlink:to="loc_us-gaapRangeMember" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaapRangeMember_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapRangeAxis" xlink:to="loc_us-gaapRangeMember_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MinimumMember" xlink:label="loc_us-gaapMinimumMember_20" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapRangeMember" xlink:to="loc_us-gaapMinimumMember_20" xlink:type="arc" order="21" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaapMaximumMember_30" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapRangeMember" xlink:to="loc_us-gaapMaximumMember_30" xlink:type="arc" order="31" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_OutstandingBeginningBalanceNumberOfWarrants" xlink:label="loc_FSNNOutstandingBeginningBalanceNumberOfWarrants_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNOutstandingBeginningBalanceNumberOfWarrants_70" xlink:type="arc" order="0" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_GrantedNumberOfWarrants" xlink:label="loc_FSNNGrantedNumberOfWarrants_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNGrantedNumberOfWarrants_70" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_ExpiredNumberOfWarrants" xlink:label="loc_FSNNExpiredNumberOfWarrants_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNExpiredNumberOfWarrants_70" xlink:type="arc" order="2" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_ExercisedNumberOfWarrants" xlink:label="loc_FSNNExercisedNumberOfWarrants_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNExercisedNumberOfWarrants_70" xlink:type="arc" order="3" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_OutstandingEndingBalanceNumberOfWarrants" xlink:label="loc_FSNNOutstandingEndingBalanceNumberOfWarrants_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNOutstandingEndingBalanceNumberOfWarrants_70" xlink:type="arc" order="4" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_OutstandingBeginningBalanceWeightedAverageExercisePrice" xlink:label="loc_FSNNOutstandingBeginningBalanceWeightedAverageExercisePrice_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNOutstandingBeginningBalanceWeightedAverageExercisePrice_70" xlink:type="arc" order="5" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_GrantedWeightedAverageExercisePrice" xlink:label="loc_FSNNGrantedWeightedAverageExercisePrice_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNGrantedWeightedAverageExercisePrice_70" xlink:type="arc" order="6" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_ExpiredWeightedAverageExercisePrice" xlink:label="loc_FSNNExpiredWeightedAverageExercisePrice_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNExpiredWeightedAverageExercisePrice_70" xlink:type="arc" order="7" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_ExercisedWeightedAverageExercisePrice" xlink:label="loc_FSNNExercisedWeightedAverageExercisePrice_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNExercisedWeightedAverageExercisePrice_70" xlink:type="arc" order="8" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_OutstandingEndingBalanceWeightedAverageExercisePrice" xlink:label="loc_FSNNOutstandingEndingBalanceWeightedAverageExercisePrice_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNOutstandingEndingBalanceWeightedAverageExercisePrice_70" xlink:type="arc" order="9" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_OutstandingWarrantsBeginningBalancePerShareExercisePrice" xlink:label="loc_FSNNOutstandingWarrantsBeginningBalancePerShareExercisePrice_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNOutstandingWarrantsBeginningBalancePerShareExercisePrice_70" xlink:type="arc" order="10" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_GrantedWarrantsPerShareExercisePrice" xlink:label="loc_FSNNGrantedWarrantsPerShareExercisePrice_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNGrantedWarrantsPerShareExercisePrice_70" xlink:type="arc" order="11" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_ExpiredWarrantsPerShareExercisePrice" xlink:label="loc_FSNNExpiredWarrantsPerShareExercisePrice_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNExpiredWarrantsPerShareExercisePrice_70" xlink:type="arc" order="12" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_ExercisedWarrantsPerShareExercisePrice" xlink:label="loc_FSNNExercisedWarrantsPerShareExercisePrice_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNExercisedWarrantsPerShareExercisePrice_70" xlink:type="arc" order="13" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_OutstandingEndingBalanceWarrantsPerShareExercisePrice" xlink:label="loc_FSNNOutstandingEndingBalanceWarrantsPerShareExercisePrice_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNOutstandingEndingBalanceWarrantsPerShareExercisePrice_70" xlink:type="arc" order="14" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/EquityTransactionsDetailsNarrative" xlink:title="00000083 - Disclosure - 16. Equity Transactions (Details Narrative )">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" xlink:type="arc" order="10" xbrldt:closed="true" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_TitleOfIndividualAxis" xlink:label="loc_us-gaapTitleOfIndividualAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapTitleOfIndividualAxis" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_TitleOfIndividualWithRelationshipToEntityDomain" xlink:label="loc_us-gaapTitleOfIndividualWithRelationshipToEntityDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapTitleOfIndividualAxis" xlink:to="loc_us-gaapTitleOfIndividualWithRelationshipToEntityDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_TitleOfIndividualWithRelationshipToEntityDomain" xlink:label="loc_us-gaapTitleOfIndividualWithRelationshipToEntityDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapTitleOfIndividualAxis" xlink:to="loc_us-gaapTitleOfIndividualWithRelationshipToEntityDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ChiefExecutiveOfficerMember" xlink:label="loc_us-gaapChiefExecutiveOfficerMember_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTitleOfIndividualWithRelationshipToEntityDomain" xlink:to="loc_us-gaapChiefExecutiveOfficerMember_40" xlink:type="arc" order="41" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DirectorMember" xlink:label="loc_us-gaapDirectorMember_50" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTitleOfIndividualWithRelationshipToEntityDomain" xlink:to="loc_us-gaapDirectorMember_50" xlink:type="arc" order="51" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_CumulativeConvertiblePreferredStockIssuedToInvestorsShares" xlink:label="loc_FSNNCumulativeConvertiblePreferredStockIssuedToInvestorsShares_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNCumulativeConvertiblePreferredStockIssuedToInvestorsShares_70" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_CumulativeConvertiblePreferredStockParValue" xlink:label="loc_FSNNCumulativeConvertiblePreferredStockParValue_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNCumulativeConvertiblePreferredStockParValue_70" xlink:type="arc" order="2" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_WarrantsToPurchaseCommonStockIssuedToInvestors" xlink:label="loc_FSNNWarrantsToPurchaseCommonStockIssuedToInvestors_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNWarrantsToPurchaseCommonStockIssuedToInvestors_70" xlink:type="arc" order="3" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_DerivativeLiabilityRelatedToInvestorWarrants" xlink:label="loc_FSNNDerivativeLiabilityRelatedToInvestorWarrants_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNDerivativeLiabilityRelatedToInvestorWarrants_70" xlink:type="arc" order="4" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_FairValueRelatedToRemainingInvestorWarrants" xlink:label="loc_FSNNFairValueRelatedToRemainingInvestorWarrants_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNFairValueRelatedToRemainingInvestorWarrants_70" xlink:type="arc" order="5" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_FairValueOfDerivativeLiability" xlink:label="loc_FSNNFairValueOfDerivativeLiability_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNFairValueOfDerivativeLiability_70" xlink:type="arc" order="6" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_SeriesB1PreferredStockOutstanding" xlink:label="loc_FSNNSeriesB1PreferredStockOutstanding_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNSeriesB1PreferredStockOutstanding_70" xlink:type="arc" order="7" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_SeriesB1PreferredStockConvertibleIntoCommonStockShares" xlink:label="loc_FSNNSeriesB1PreferredStockConvertibleIntoCommonStockShares_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNSeriesB1PreferredStockConvertibleIntoCommonStockShares_70" xlink:type="arc" order="8" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_SeriesA1A2AndA4PreferredStockOutstandingShares" xlink:label="loc_FSNNSeriesA1A2AndA4PreferredStockOutstandingShares_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNSeriesA1A2AndA4PreferredStockOutstandingShares_70" xlink:type="arc" order="9" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_CommonStockIssuedToAccreditedInvestorsShares" xlink:label="loc_FSNNCommonStockIssuedToAccreditedInvestorsShares_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNCommonStockIssuedToAccreditedInvestorsShares_70" xlink:type="arc" order="10" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_WarrantsToPurchaseCommonStockUnderSubscriptionAgreement" xlink:label="loc_FSNNWarrantsToPurchaseCommonStockUnderSubscriptionAgreement_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNWarrantsToPurchaseCommonStockUnderSubscriptionAgreement_70" xlink:type="arc" order="11" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_ConsiderationAmountUnderSubscriptionAgreement" xlink:label="loc_FSNNConsiderationAmountUnderSubscriptionAgreement_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNConsiderationAmountUnderSubscriptionAgreement_70" xlink:type="arc" order="12" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_OfficerConvertedCommonStockShares" xlink:label="loc_FSNNOfficerConvertedCommonStockShares_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNOfficerConvertedCommonStockShares_70" xlink:type="arc" order="13" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_OfficerConvertedCommonStockAmount" xlink:label="loc_FSNNOfficerConvertedCommonStockAmount_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNOfficerConvertedCommonStockAmount_70" xlink:type="arc" order="14" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_WarrantsIssuedToOfficerToPurchaseCommonStock" xlink:label="loc_FSNNWarrantsIssuedToOfficerToPurchaseCommonStock_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNWarrantsIssuedToOfficerToPurchaseCommonStock_70" xlink:type="arc" order="15" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_CommonStockIssuedToThirdPartiesShares" xlink:label="loc_FSNNCommonStockIssuedToThirdPartiesShares_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNCommonStockIssuedToThirdPartiesShares_70" xlink:type="arc" order="16" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_CommonStockIssuedToThirdPartiesAmount" xlink:label="loc_FSNNCommonStockIssuedToThirdPartiesAmount_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNCommonStockIssuedToThirdPartiesAmount_70" xlink:type="arc" order="17" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonStockSharesAuthorized" xlink:label="loc_us-gaapCommonStockSharesAuthorized_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapCommonStockSharesAuthorized_70" xlink:type="arc" order="18" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonStockSharesIssued" xlink:label="loc_us-gaapCommonStockSharesIssued_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapCommonStockSharesIssued_70" xlink:type="arc" order="19" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonStockSharesOutstanding" xlink:label="loc_us-gaapCommonStockSharesOutstanding_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapCommonStockSharesOutstanding_70" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_WeightedaverageEstimatedFairValueOfStockOptionsGranted" xlink:label="loc_FSNNWeightedaverageEstimatedFairValueOfStockOptionsGranted_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNWeightedaverageEstimatedFairValueOfStockOptionsGranted_70" xlink:type="arc" order="21" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_UnrecognizedCompensationCostRelatedToStockOptionsGranted" xlink:label="loc_FSNNUnrecognizedCompensationCostRelatedToStockOptionsGranted_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNUnrecognizedCompensationCostRelatedToStockOptionsGranted_70" xlink:type="arc" order="22" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_UnrecognizedCompensationRecognitionWeightedaveragePeriod" xlink:label="loc_FSNNUnrecognizedCompensationRecognitionWeightedaveragePeriod_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNUnrecognizedCompensationRecognitionWeightedaveragePeriod_70" xlink:type="arc" order="23" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_LossOnExtinguishmentOfDebt" xlink:label="loc_FSNNLossOnExtinguishmentOfDebt_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNLossOnExtinguishmentOfDebt_70" xlink:type="arc" order="24" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/DerivativeLiabilityDetails" xlink:title="00000084 - Disclosure - 17. Derivative Liability (Details)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" xlink:type="arc" order="10" xbrldt:closed="true" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaapAwardTypeAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapAwardTypeAxis" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaapShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapAwardTypeAxis" xlink:to="loc_us-gaapShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaapShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapAwardTypeAxis" xlink:to="loc_us-gaapShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_WarrantMember" xlink:label="loc_us-gaapWarrantMember_0" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="loc_us-gaapWarrantMember_0" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaapRangeAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapRangeAxis" xlink:type="arc" order="2" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaapRangeMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapRangeAxis" xlink:to="loc_us-gaapRangeMember" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaapRangeMember_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapRangeAxis" xlink:to="loc_us-gaapRangeMember_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MinimumMember" xlink:label="loc_us-gaapMinimumMember_20" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapRangeMember" xlink:to="loc_us-gaapMinimumMember_20" xlink:type="arc" order="22" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaapMaximumMember_30" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapRangeMember" xlink:to="loc_us-gaapMaximumMember_30" xlink:type="arc" order="32" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_StockPrice" xlink:label="loc_FSNNStockPrice_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNStockPrice_70" xlink:type="arc" order="0" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_ExercisePrice" xlink:label="loc_FSNNExercisePrice_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_FSNNExercisePrice_70" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" xlink:label="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_70" xlink:type="arc" order="2" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate" xlink:label="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_70" xlink:type="arc" order="3" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms" xlink:label="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms_70" xlink:type="arc" order="4" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/FairValueDisclosuresDetails" xlink:title="00000085 - Disclosure - 18. Fair Value Disclosures (Details)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" xlink:type="arc" order="10" xbrldt:closed="true" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueByLiabilityClassAxis" xlink:label="loc_us-gaapFairValueByLiabilityClassAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapFairValueByLiabilityClassAxis" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaapScenarioUnspecifiedDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapFairValueByLiabilityClassAxis" xlink:to="loc_us-gaapScenarioUnspecifiedDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaapScenarioUnspecifiedDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapFairValueByLiabilityClassAxis" xlink:to="loc_us-gaapScenarioUnspecifiedDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_LevelOneMember" xlink:label="loc_FSNNLevelOneMember_0" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapScenarioUnspecifiedDomain" xlink:to="loc_FSNNLevelOneMember_0" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_LevelTwoMember" xlink:label="loc_FSNNLevelTwoMember_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapScenarioUnspecifiedDomain" xlink:to="loc_FSNNLevelTwoMember_10" xlink:type="arc" order="11" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_LevelThreeMember" xlink:label="loc_FSNNLevelThreeMember_20" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapScenarioUnspecifiedDomain" xlink:to="loc_FSNNLevelThreeMember_20" xlink:type="arc" order="21" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LiabilitiesNoncurrentAbstract" xlink:label="loc_us-gaapLiabilitiesNoncurrentAbstract_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapLiabilitiesNoncurrentAbstract_90" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeNet" xlink:label="loc_us-gaapDerivativeFairValueOfDerivativeNet_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapLiabilitiesNoncurrentAbstract_90" xlink:to="loc_us-gaapDerivativeFairValueOfDerivativeNet_90" xlink:type="arc" order="2" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/FairValueDisclosuresDetails1" xlink:title="00000086 - Disclosure - 18. Fair Value Disclosures (Details 1)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/IncomeTaxesDetails" xlink:title="00000087 - Disclosure - 19. Income Taxes (Details)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/IncomeTaxesDetails1" xlink:title="00000088 - Disclosure - 19. Income Taxes (Details 1)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/IncomeTaxesDetails2" xlink:title="00000089 - Disclosure - 19. Income Taxes (Details 2)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/IncomeTaxesDetailsNarrative" xlink:title="00000090 - Disclosure - 19. Income Taxes (Details Narrative)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/CommitmentsAndContingenciesDetails" xlink:title="00000091 - Disclosure - 20. Commitments and Contingencies (Details)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/CommitmentsAndContingenciesDetailsNarrative" xlink:title="00000092 - Disclosure - 20. Commitments and Contingencies (Details Narrative)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/ConcentrationsDetails" xlink:title="00000093 - Disclosure - 22. Concentrations (Details)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/ConcentrationsDetailsNarrative" xlink:title="00000094 - Disclosure - 22. Concentrations (Details Narrative)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" xlink:type="arc" order="10" xbrldt:closed="true" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MajorCustomersAxis" xlink:label="loc_us-gaapMajorCustomersAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapMajorCustomersAxis" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NameOfMajorCustomerDomain" xlink:label="loc_us-gaapNameOfMajorCustomerDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapMajorCustomersAxis" xlink:to="loc_us-gaapNameOfMajorCustomerDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NameOfMajorCustomerDomain" xlink:label="loc_us-gaapNameOfMajorCustomerDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapMajorCustomersAxis" xlink:to="loc_us-gaapNameOfMajorCustomerDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_CustomerOneMember" xlink:label="loc_FSNNCustomerOneMember_0" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapNameOfMajorCustomerDomain" xlink:to="loc_FSNNCustomerOneMember_0" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis" xlink:label="loc_us-gaapConcentrationRiskByBenchmarkAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapConcentrationRiskByBenchmarkAxis" xlink:type="arc" order="2" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ConcentrationRiskBenchmarkDomain" xlink:label="loc_us-gaapConcentrationRiskBenchmarkDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapConcentrationRiskByBenchmarkAxis" xlink:to="loc_us-gaapConcentrationRiskBenchmarkDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ConcentrationRiskBenchmarkDomain" xlink:label="loc_us-gaapConcentrationRiskBenchmarkDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapConcentrationRiskByBenchmarkAxis" xlink:to="loc_us-gaapConcentrationRiskBenchmarkDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccountsReceivableMember" xlink:label="loc_us-gaapAccountsReceivableMember_0" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapConcentrationRiskBenchmarkDomain" xlink:to="loc_us-gaapAccountsReceivableMember_0" xlink:type="arc" order="2" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ConcentrationRiskPercentage1" xlink:label="loc_us-gaapConcentrationRiskPercentage1_30" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapConcentrationRiskPercentage1_30" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccountsReceivableNetCurrent" xlink:label="loc_us-gaapAccountsReceivableNetCurrent_30" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapAccountsReceivableNetCurrent_30" xlink:type="arc" order="2" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://fusiontel.com/role/SegmentInformationDetails" xlink:title="00000095 - Disclosure - 23. Segment Information (Details)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SegmentReportingInformationLineItems" xlink:label="loc_us-gaapSegmentReportingInformationLineItems" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" xlink:label="loc_us-gaapScheduleOfSegmentReportingInformationBySegmentTable" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapSegmentReportingInformationLineItems" xlink:to="loc_us-gaapScheduleOfSegmentReportingInformationBySegmentTable" xlink:type="arc" order="10" xbrldt:closed="true" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaapStatementBusinessSegmentsAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfSegmentReportingInformationBySegmentTable" xlink:to="loc_us-gaapStatementBusinessSegmentsAxis" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaapSegmentDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapStatementBusinessSegmentsAxis" xlink:to="loc_us-gaapSegmentDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaapSegmentDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementBusinessSegmentsAxis" xlink:to="loc_us-gaapSegmentDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_CarrierServicesMember" xlink:label="loc_FSNNCarrierServicesMember_0" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapSegmentDomain" xlink:to="loc_FSNNCarrierServicesMember_0" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_CorporateServicesAndOtherMember" xlink:label="loc_FSNNCorporateServicesAndOtherMember_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapSegmentDomain" xlink:to="loc_FSNNCorporateServicesAndOtherMember_10" xlink:type="arc" order="11" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_CorporateAndUnallocatedMember" xlink:label="loc_FSNNCorporateAndUnallocatedMember_20" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapSegmentDomain" xlink:to="loc_FSNNCorporateAndUnallocatedMember_20" xlink:type="arc" order="21" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_ConsolidatedMember" xlink:label="loc_FSNNConsolidatedMember_30" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapSegmentDomain" xlink:to="loc_FSNNConsolidatedMember_30" xlink:type="arc" order="31" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_Revenues" xlink:label="loc_us-gaapRevenues_170" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapSegmentReportingInformationLineItems" xlink:to="loc_us-gaapRevenues_170" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CostOfRevenue" xlink:label="loc_us-gaapCostOfRevenue_170" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapSegmentReportingInformationLineItems" xlink:to="loc_us-gaapCostOfRevenue_170" xlink:type="arc" order="2" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_GrossProfit" xlink:label="loc_us-gaapGrossProfit_170" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapSegmentReportingInformationLineItems" xlink:to="loc_us-gaapGrossProfit_170" xlink:type="arc" order="3" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DepreciationAndAmortization" xlink:label="loc_us-gaapDepreciationAndAmortization_170" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapSegmentReportingInformationLineItems" xlink:to="loc_us-gaapDepreciationAndAmortization_170" xlink:type="arc" order="4" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SellingGeneralAndAdministrativeExpense" xlink:label="loc_us-gaapSellingGeneralAndAdministrativeExpense_170" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapSegmentReportingInformationLineItems" xlink:to="loc_us-gaapSellingGeneralAndAdministrativeExpense_170" xlink:type="arc" order="5" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_InterestExpense" xlink:label="loc_us-gaapInterestExpense_170" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapSegmentReportingInformationLineItems" xlink:to="loc_us-gaapInterestExpense_170" xlink:type="arc" order="6" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt" xlink:label="loc_us-gaapGainsLossesOnExtinguishmentOfDebt_170" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapSegmentReportingInformationLineItems" xlink:to="loc_us-gaapGainsLossesOnExtinguishmentOfDebt_170" xlink:type="arc" order="7" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DerivativeGainLossOnDerivativeNet" xlink:label="loc_us-gaapDerivativeGainLossOnDerivativeNet_170" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapSegmentReportingInformationLineItems" xlink:to="loc_us-gaapDerivativeGainLossOnDerivativeNet_170" xlink:type="arc" order="8" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherExpenses" xlink:label="loc_us-gaapOtherExpenses_170" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapSegmentReportingInformationLineItems" xlink:to="loc_us-gaapOtherExpenses_170" xlink:type="arc" order="9" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_LossGainOnExtinguishmentOfAccountsPayable" xlink:label="loc_FSNNLossGainOnExtinguishmentOfAccountsPayable_170" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapSegmentReportingInformationLineItems" xlink:to="loc_FSNNLossGainOnExtinguishmentOfAccountsPayable_170" xlink:type="arc" order="10" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaapIncomeTaxExpenseBenefit_170" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapSegmentReportingInformationLineItems" xlink:to="loc_us-gaapIncomeTaxExpenseBenefit_170" xlink:type="arc" order="11" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeLossFromContinuingOperations" xlink:label="loc_us-gaapIncomeLossFromContinuingOperations_170" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapSegmentReportingInformationLineItems" xlink:to="loc_us-gaapIncomeLossFromContinuingOperations_170" xlink:type="arc" order="12" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaapAssets_170" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapSegmentReportingInformationLineItems" xlink:to="loc_us-gaapAssets_170" xlink:type="arc" order="13" />
      <link:loc xlink:type="locator" xlink:href="fsnn-20151231.xsd#FSNN_CapitalExpenditures" xlink:label="loc_FSNNCapitalExpenditures_170" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapSegmentReportingInformationLineItems" xlink:to="loc_FSNNCapitalExpenditures_170" xlink:type="arc" order="14" />
    </link:definitionLink>
</link:linkbase>


