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  <xsd:element name="BusinessAcquisitionPurchasePriceAllocationDeferredIncomeTaxesLiability" id="sncr_BusinessAcquisitionPurchasePriceAllocationDeferredIncomeTaxesLiability" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="BusinessAcquisitionPurchasePriceAllocationAssetsAcquiredLiabilitiesAssumedNetExcludingGoodwill" id="sncr_BusinessAcquisitionPurchasePriceAllocationAssetsAcquiredLiabilitiesAssumedNetExcludingGoodwill" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="BusinessAcquisitionConsiderationWorkingCapitalDeficiency" id="sncr_BusinessAcquisitionConsiderationWorkingCapitalDeficiency" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAxis" id="sncr_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAxis" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeDomain" id="sncr_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeDomain" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="EmployeeStockPurchasePlanMember" id="sncr_EmployeeStockPurchasePlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AllocatedShareBasedCompensationExpensePerDilutedShare" id="sncr_AllocatedShareBasedCompensationExpensePerDilutedShare" type="num:perShareItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrantRollforward" id="sncr_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrantRollforward" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresQualifyingForReissuanceAsNewGrants" id="sncr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresQualifyingForReissuanceAsNewGrants" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsAndForfeituresInPeriod" id="sncr_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsAndForfeituresInPeriod" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardRangeOfSharesAvailableForPotentialIssuance" id="sncr_ShareBasedCompensationArrangementByShareBasedPaymentAwardRangeOfSharesAvailableForPotentialIssuance" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePricePerShareRangeAbstract" id="sncr_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePricePerShareRangeAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" 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="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingOptionExercisePrice" id="sncr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingOptionExercisePrice" type="num:perShareItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodOptionExercisePrice" id="sncr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodOptionExercisePrice" type="num:perShareItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodOptionExercisePrice" id="sncr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodOptionExercisePrice" type="num:perShareItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriodOptionExercisePrice" id="sncr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriodOptionExercisePrice" type="num:perShareItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageExercisePriceAbstract" id="sncr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageExercisePriceAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityAwardsGrantedToNumberOfParticipantOwnMoreThanFivePercentOfTotalCombinedVotingPower" id="sncr_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityAwardsGrantedToNumberOfParticipantOwnMoreThanFivePercentOfTotalCombinedVotingPower" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfEmployeePurchasedMoreThanOneSharePerPeriod" id="sncr_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfEmployeePurchasedMoreThanOneSharePerPeriod" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <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="EmployeeStockPurchasePlanParticipationPeriod" id="sncr_EmployeeStockPurchasePlanParticipationPeriod" 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="SpeechCycleIncMember" id="sncr_SpeechCycleIncMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="StockRepurchaseProgramPeriodInForceInMonths" id="sncr_StockRepurchaseProgramPeriodInForceInMonths" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RecentAccountingPronouncementsDisclosureAbstract" id="sncr_RecentAccountingPronouncementsDisclosureAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="EarnOutSharesValueIssuable" id="sncr_EarnOutSharesValueIssuable" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="EarnOutSharesSharesIssuable" id="sncr_EarnOutSharesSharesIssuable" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IssuanceValueOfEarnOutShares" id="sncr_IssuanceValueOfEarnOutShares" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="IssuanceSharesOfEarnOutShares" id="sncr_IssuanceSharesOfEarnOutShares" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CapitalTransactionsDisclosureAbstract" id="sncr_CapitalTransactionsDisclosureAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CapitalTransactionsDisclosureTextBlock" id="sncr_CapitalTransactionsDisclosureTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CapitalLeaseAgreementTerm" id="sncr_CapitalLeaseAgreementTerm" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfConsecutiveLeaseTermExtensions" id="sncr_NumberOfConsecutiveLeaseTermExtensions" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CapitalLeaseAgreementTermExtensionPeriod" id="sncr_CapitalLeaseAgreementTermExtensionPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FiniteLivedIntangibleAssetsEstimatedFutureAnnualAmortizationExpense" id="sncr_FiniteLivedIntangibleAssetsEstimatedFutureAnnualAmortizationExpense" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="ServiceLevelStandardsPolicyTextBlock" id="sncr_ServiceLevelStandardsPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ConcentrationRiskCreditRiskPolicyTextBlock" id="sncr_ConcentrationRiskCreditRiskPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TransactionAndSubscriptionServiceArrangementsMember" id="sncr_TransactionAndSubscriptionServiceArrangementsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ProfessionalServiceAndSoftwareLicenseArrangementsMember" id="sncr_ProfessionalServiceAndSoftwareLicenseArrangementsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SoftwareLicenseArrangementsMember" id="sncr_SoftwareLicenseArrangementsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TransactionServiceArrangementsMember" id="sncr_TransactionServiceArrangementsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SubscriptionServiceArrangementsMember" id="sncr_SubscriptionServiceArrangementsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RevenueRecognitionMultipleDeliverableArrangementsPercentageOfIndividualArrangementRevenueToNetRevenues" id="sncr_RevenueRecognitionMultipleDeliverableArrangementsPercentageOfIndividualArrangementRevenueToNetRevenues" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CashEquivalentsOriginalMaturityPeriodMaximum" id="sncr_CashEquivalentsOriginalMaturityPeriodMaximum" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TopFiveCustomersMember" id="sncr_TopFiveCustomersMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ATAndTIncMember" id="sncr_ATAndTIncMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="VerizonWirelessMember" id="sncr_VerizonWirelessMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TimeWarnerCableMember" id="sncr_TimeWarnerCableMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ConcentrationRiskCreditRiskFinancialInstrumentDenominationsForExcessCashDeposits" id="sncr_ConcentrationRiskCreditRiskFinancialInstrumentDenominationsForExcessCashDeposits" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="NumberOfTopCustomers" id="sncr_NumberOfTopCustomers" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="MarketableSecuritiesFixedIncomeInvestmentsMaturityPeriod" id="sncr_MarketableSecuritiesFixedIncomeInvestmentsMaturityPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MarketableSecuritiesMaturityPeriod" id="sncr_MarketableSecuritiesMaturityPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CapitalizedComputerSoftwareUsefulLifeMinimum" id="sncr_CapitalizedComputerSoftwareUsefulLifeMinimum" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CapitalizedComputerSoftwareUsefulLifeMaximum" id="sncr_CapitalizedComputerSoftwareUsefulLifeMaximum" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="UnrecognizedTaxBenefitReservesIncludingInterestRelatedToUncertainPositions" id="sncr_UnrecognizedTaxBenefitReservesIncludingInterestRelatedToUncertainPositions" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="UnrecognizedTaxBenefitsNoncurrentThatWouldImpactEffectiveTaxRate" id="sncr_UnrecognizedTaxBenefitsNoncurrentThatWouldImpactEffectiveTaxRate" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccruedPeriodIncreaseDecrease" id="sncr_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccruedPeriodIncreaseDecrease" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="UnrecognizedTaxBenefitsCurrentThatWouldImpactEffectiveTaxRate" id="sncr_UnrecognizedTaxBenefitsCurrentThatWouldImpactEffectiveTaxRate" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="PerformanceAwardMember" id="sncr_PerformanceAwardMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfStockBasedCompensationPlans" id="sncr_NumberOfStockBasedCompensationPlans" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="NumberOfBusinessesEntityIsManagedAndOperatedAs" id="sncr_NumberOfBusinessesEntityIsManagedAndOperatedAs" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AccruedThirdPartyProcessingFeeCurrent" id="sncr_AccruedThirdPartyProcessingFeeCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="CapitalStockSharesAuthorized" id="sncr_CapitalStockSharesAuthorized" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="CapitalStockParOrStatedValuePerShare" id="sncr_CapitalStockParOrStatedValuePerShare" type="num:perShareItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="StockIncentive2000PlanMember" id="sncr_StockIncentive2000PlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="StockIncentive2006PlanMember" id="sncr_StockIncentive2006PlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="StockIncentive2010PlanMember" id="sncr_StockIncentive2010PlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfVotesPerShare" id="sncr_NumberOfVotesPerShare" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="StockIncentive2000And2006PlanMember" id="sncr_StockIncentive2000And2006PlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardAdditionalNumberOfSharesReservedForPlan" id="sncr_ShareBasedCompensationArrangementByShareBasedPaymentAwardAdditionalNumberOfSharesReservedForPlan" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingOptionExercisePrice" id="sncr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingOptionExercisePrice" type="num:perShareItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardIssuePriceAsPercentageOfGrantDateFairMarketValueMinimum" id="sncr_ShareBasedCompensationArrangementByShareBasedPaymentAwardIssuePriceAsPercentageOfGrantDateFairMarketValueMinimum" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardExercisableOptionsAsPercentageOfSharesSubjectToVesting" id="sncr_ShareBasedCompensationArrangementByShareBasedPaymentAwardExercisableOptionsAsPercentageOfSharesSubjectToVesting" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfOptionsVestingOnFirstAnniversaryOfGrantDate" id="sncr_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfOptionsVestingOnFirstAnniversaryOfGrantDate" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardMonthlyPortionOfOptionsVestingThereafter" id="sncr_ShareBasedCompensationArrangementByShareBasedPaymentAwardMonthlyPortionOfOptionsVestingThereafter" type="xbrli:decimalItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfOptionsVestingOnSecondAnniversaryOfGrantDate" id="sncr_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfOptionsVestingOnSecondAnniversaryOfGrantDate" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityAwardsGrantedNumberOfNewlyHiredEmployees" id="sncr_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityAwardsGrantedNumberOfNewlyHiredEmployees" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityAwardsGrantedNumberOfNewlyAppointedExecutiveOfficers" id="sncr_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityAwardsGrantedNumberOfNewlyAppointedExecutiveOfficers" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriodTotalIntrinsicValue" id="sncr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriodTotalIntrinsicValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriodTotalFairValue" id="sncr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriodTotalFairValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue" id="sncr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue" type="num:perShareItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriodWeightedAverageGrantDateFairValue" id="sncr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriodWeightedAverageGrantDateFairValue" type="num:perShareItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeitedInPeriodWeightedAverageGrantDateFairValue" id="sncr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeitedInPeriodWeightedAverageGrantDateFairValue" type="num:perShareItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationNonQualifiedOptions" id="sncr_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationNonQualifiedOptions" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ExercisePriceRangeBetween0.29To5.50Member" id="sncr_ExercisePriceRangeBetween0.29To5.50Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ExercisePriceRangeBetween5.51To11.00Member" id="sncr_ExercisePriceRangeBetween5.51To11.00Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ExercisePriceRangeBetween11.01To16.50Member" id="sncr_ExercisePriceRangeBetween11.01To16.50Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ExercisePriceRangeBetween16.51To22.00Member" id="sncr_ExercisePriceRangeBetween16.51To22.00Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ExercisePriceRangeBetween22.01To27.50Member" id="sncr_ExercisePriceRangeBetween22.01To27.50Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ExercisePriceRangeBetween27.51To33.00Member" id="sncr_ExercisePriceRangeBetween27.51To33.00Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ExercisePriceRangeBetween33.01To38.50Member" id="sncr_ExercisePriceRangeBetween33.01To38.50Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ExercisePriceRangeBetween38.51To44.00Member" id="sncr_ExercisePriceRangeBetween38.51To44.00Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ExercisePriceRangeBetween0.29To9.93Member" id="sncr_ExercisePriceRangeBetween0.29To9.93Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ExercisePriceRangeBetween10.04To14.00Member" id="sncr_ExercisePriceRangeBetween10.04To14.00Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ExercisePriceRangeBetween15.89To20.71Member" id="sncr_ExercisePriceRangeBetween15.89To20.71Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ExercisePriceRangeBetween20.91To24.46Member" id="sncr_ExercisePriceRangeBetween20.91To24.46Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ExercisePriceRangeBetween26.83To27.92Member" id="sncr_ExercisePriceRangeBetween26.83To27.92Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ExercisePriceRangeBetween28.46To30.41Member" id="sncr_ExercisePriceRangeBetween28.46To30.41Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ExercisePriceRangeBetween30.50To30.50Member" id="sncr_ExercisePriceRangeBetween30.50To30.50Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ExercisePriceRangeBetween31.71To38.62Member" id="sncr_ExercisePriceRangeBetween31.71To38.62Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingAbstract" id="sncr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsAbstract" id="sncr_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfClassificationOfDeferredTaxAssetsAndLiabilitiesTableTextBlock" id="sncr_ScheduleOfClassificationOfDeferredTaxAssetsAndLiabilitiesTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="EffectiveIncomeTaxRateBusinessAcquisitionContingentConsiderationFairMarketValueAdjustments" id="sncr_EffectiveIncomeTaxRateBusinessAcquisitionContingentConsiderationFairMarketValueAdjustments" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="EffectiveIncomeTaxRateReconciliationFederalNetOperatingLosses" id="sncr_EffectiveIncomeTaxRateReconciliationFederalNetOperatingLosses" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncomeTaxTable" id="sncr_IncomeTaxTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CountryAxis" id="sncr_CountryAxis" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncomeTaxLineItems" id="sncr_IncomeTaxLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DeferredTaxAssetsFixedAndIntangibleAssets" id="sncr_DeferredTaxAssetsFixedAndIntangibleAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="DeferredTaxAssetsLiabilitiesGrossCurrent" id="sncr_DeferredTaxAssetsLiabilitiesGrossCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="DeferredTaxAssetsLiabilitiesGrossNoncurrent" id="sncr_DeferredTaxAssetsLiabilitiesGrossNoncurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="ScheduleOfFutureMinimumRentalPaymentsForCapitalAndOperatingLeasesTableTextBlock" id="sncr_ScheduleOfFutureMinimumRentalPaymentsForCapitalAndOperatingLeasesTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OperatingLeasesFutureMinimumPaymentsDueInFiveYearsAndThereafter" id="sncr_OperatingLeasesFutureMinimumPaymentsDueInFiveYearsAndThereafter" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="GoodwillReclassificationsAdjustmentsAndOther" id="sncr_GoodwillReclassificationsAdjustmentsAndOther" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" 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="MinimumNumberOfFortune500CompaniesIncludedInServiceUtilizers" id="sncr_MinimumNumberOfFortune500CompaniesIncludedInServiceUtilizers" type="xbrli:integerItemType" substitutionGroup="xbrli:item" 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="InfringementOfPatentNumber" id="sncr_InfringementOfPatentNumber" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercised" id="sncr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercised" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="BusinessAcquisitionPaymentToAcquireSharesAndWarrants" id="sncr_BusinessAcquisitionPaymentToAcquireSharesAndWarrants" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="BusinessAcquisitionSurplusPaymentForWorkingCapital" id="sncr_BusinessAcquisitionSurplusPaymentForWorkingCapital" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="BusinessAcquisitionCostOfAcquiredEntityConsiderationWorkingCapitalSurplus" id="sncr_BusinessAcquisitionCostOfAcquiredEntityConsiderationWorkingCapitalSurplus" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="BusinessAcquisitionCostOfAcquiredEntityIncludingWorkingCapitalSurplus" id="sncr_BusinessAcquisitionCostOfAcquiredEntityIncludingWorkingCapitalSurplus" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="ExpectedPeriodInWhichToFinalizePurchasePriceAllocation" id="sncr_ExpectedPeriodInWhichToFinalizePurchasePriceAllocation" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEmployeeStockPurchasePlanAbstract" id="sncr_ShareBasedCompensationArrangementByShareBasedPaymentAwardEmployeeStockPurchasePlanAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SpatialSystemsNomineesPTYLimitedMember" id="sncr_SpatialSystemsNomineesPTYLimitedMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OaklandMember" id="sncr_OaklandMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ProfessionalServiceArrangementsMember" id="sncr_ProfessionalServiceArrangementsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="UnrecognizedTaxBenefitsNoncurrentReductionInEffectiveTaxRate" id="sncr_UnrecognizedTaxBenefitsNoncurrentReductionInEffectiveTaxRate" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="NewbaySoftwareLimitedMember" id="sncr_NewbaySoftwareLimitedMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="BusinessAcquisitionCostOfAcquiredEntityClosingAdjustment" id="sncr_BusinessAcquisitionCostOfAcquiredEntityClosingAdjustment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="AccruedConsultingFeesCurrent" id="sncr_AccruedConsultingFeesCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="AccruedAcquisitionCostsCurrent" id="sncr_AccruedAcquisitionCostsCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="SeparationCosts" id="sncr_SeparationCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="ChangeInAnnualEffectiveTaxRateForNextYearDueToEnactmentOfTaxLaw" id="sncr_ChangeInAnnualEffectiveTaxRateForNextYearDueToEnactmentOfTaxLaw" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="BusinessAcquisitionCostOfAcquiredEntityEquityInterestsIssuedAndIssuablePortionConsideredAsPurchasePriceBasedOnClosingStockPrice" id="sncr_BusinessAcquisitionCostOfAcquiredEntityEquityInterestsIssuedAndIssuablePortionConsideredAsPurchasePriceBasedOnClosingStockPrice" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="BusinessAcquisitionCostOfAcquiredEntityRemainingEquityInterestsIssuedAndIssuableAmortizationTerm" id="sncr_BusinessAcquisitionCostOfAcquiredEntityRemainingEquityInterestsIssuedAndIssuableAmortizationTerm" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="BasisOfPresentationLineItems" id="sncr_BasisOfPresentationLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="BusinessAcquisitionPurchasePriceAllocationAdjustmentAbstract" id="sncr_BusinessAcquisitionPurchasePriceAllocationAdjustmentAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfBasisOfPresentationTable" id="sncr_ScheduleOfBasisOfPresentationTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ForeignExchangeImpactOfChangeInContingentConsiderationObligation" id="sncr_ForeignExchangeImpactOfChangeInContingentConsiderationObligation" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
</xsd:schema>





