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  <xsd:element name="CertificatesOfDepositMunicipalAndCorporateBondsEnhancedIncomeFunds" id="sncr_CertificatesOfDepositMunicipalAndCorporateBondsEnhancedIncomeFunds" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <element id="sncr_AvailableForSaleSecuritiesGrossUnrealizedGainDebtMaturitiesWithinOneYear" name="AvailableForSaleSecuritiesGrossUnrealizedGainDebtMaturitiesWithinOneYear" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="sncr_AvailableForSaleSecuritiesGrossUnrealizedGainDebtMaturitiesAfterOneThroughFiveYears" name="AvailableForSaleSecuritiesGrossUnrealizedGainDebtMaturitiesAfterOneThroughFiveYears" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="sncr_AvailableForSaleSecuritiesGrossUnrealizedLossesDebtMaturitiesWithinOneYear" name="AvailableForSaleSecuritiesGrossUnrealizedLossesDebtMaturitiesWithinOneYear" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="sncr_AvailableForSaleSecuritiesGrossUnrealizedLossesDebtMaturitiesAfterOneThroughFiveYears" name="AvailableForSaleSecuritiesGrossUnrealizedLossesDebtMaturitiesAfterOneThroughFiveYears" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="sncr_BusinessAcquisitionPurchasePriceAllocationCurrentLiabilitiesAccountsPayableAndAccruedLiabilities" name="BusinessAcquisitionPurchasePriceAllocationCurrentLiabilitiesAccountsPayableAndAccruedLiabilities" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <xsd:element name="AllocatedShareBasedCompensationExpensePerDilutedShare" id="sncr_AllocatedShareBasedCompensationExpensePerDilutedShare" type="num:perShareItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageRemainingContractualTermAbstract" id="sncr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageRemainingContractualTermAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardAggregateIntrinsicValueAbstract" id="sncr_ShareBasedCompensationArrangementByShareBasedPaymentAwardAggregateIntrinsicValueAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TermOfEmployeeStockPurchasePlan" id="sncr_TermOfEmployeeStockPurchasePlan" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="EmployeeStockPurchasePlanPayrollWithholdingPeriod" id="sncr_EmployeeStockPurchasePlanPayrollWithholdingPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PercentageOfFairMarketValueOfCommonStock" id="sncr_PercentageOfFairMarketValueOfCommonStock" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PercentageMaximumOfTotalCombinedVotingPowerParticipantAllowedToBeGrantedRightToPurchaseCommonStock" id="sncr_PercentageMaximumOfTotalCombinedVotingPowerParticipantAllowedToBeGrantedRightToPurchaseCommonStock" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CustomerListsAndRelationshipsMember" id="sncr_CustomerListsAndRelationshipsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CapitalizedSoftwareAndPatentsMember" id="sncr_CapitalizedSoftwareAndPatentsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="InfringementOfPatentsMember" id="sncr_InfringementOfPatentsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1CashFlowEffect" id="sncr_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1CashFlowEffect" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="sncr_AccumulatedNetGainLossOnIntraEntityForeignCurrencyTransactionsMember" name="AccumulatedNetGainLossOnIntraEntityForeignCurrencyTransactionsMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <xsd:element name="LineOfCreditFacilityRightToIncreaseMaximumBorrowingCapacityAmount" id="sncr_LineOfCreditFacilityRightToIncreaseMaximumBorrowingCapacityAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <element id="sncr_StrumsoftIncMember" name="StrumsoftIncMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="sncr_OtherComprehensiveIncomeNetGainLossOnIntraEntityForeignCurrencyTransactionsArisingDuringPeriodNetOfTax" name="OtherComprehensiveIncomeNetGainLossOnIntraEntityForeignCurrencyTransactionsArisingDuringPeriodNetOfTax" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="sncr_ConvertibleSeniorNotesDue2019Member" name="ConvertibleSeniorNotesDue2019Member" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="sncr_DebtInstrumentRepurchasePriceAsPercentageOfPrincipalAmountRepurchased" name="DebtInstrumentRepurchasePriceAsPercentageOfPrincipalAmountRepurchased" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="sncr_FSecureCorporationMember" name="FSecureCorporationMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="sncr_ConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock" name="ConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="sncr_ConsolidationAndBasisOfAccountingAbstract" name="ConsolidationAndBasisOfAccountingAbstract" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="sncr_VoxmobiliMember" name="VoxmobiliMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="sncr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsIncludingGoodwill" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsIncludingGoodwill" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="sncr_Sncr_businessAcquisitionPurchasePriceAllocationAccruedLiabilities" name="Sncr_businessAcquisitionPurchasePriceAllocationAccruedLiabilities" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="sncr_PaymentsOnContingentConsiderationFinancingActivities" name="PaymentsOnContingentConsiderationFinancingActivities" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="sncr_EmployeeAndDirectorsStockOptionsMember" name="EmployeeAndDirectorsStockOptionsMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
</xsd:schema>