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  <element id="sncr_BusinessAcquisitionCostOfAcquiredEntityConsiderationWorkingCapitalSurplus" name="BusinessAcquisitionCostOfAcquiredEntityConsiderationWorkingCapitalSurplus" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="sncr_SpatialSystemsNomineesPTYLimitedMember" name="SpatialSystemsNomineesPTYLimitedMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <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="ForeignMember" id="sncr_ForeignMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SoftwarePurchasedMember" id="sncr_SoftwarePurchasedMember" 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" />
  <xsd:element id="sncr_PerformanceShare2013PlanMember" name="PerformanceShare2013PlanMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <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_DigiDataMember" name="DigiDataMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" 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_ClarityOssLimitedMember" name="ClarityOssLimitedMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" 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_PropertyEquipmentAndLeaseholdImprovementsMember" name="PropertyEquipmentAndLeaseholdImprovementsMember" 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_StockRepurchaseProgram2012Member" name="StockRepurchaseProgram2012Member" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="sncr_CommercialCourtOfParisShareholderComplaintMember" name="CommercialCourtOfParisShareholderComplaintMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="sncr_PaymentsToAcquireBusinessesCashPaidForSharesOfAcquiree" name="PaymentsToAcquireBusinessesCashPaidForSharesOfAcquiree" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="sncr_AcquireeEmployeesMember" name="AcquireeEmployeesMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="sncr_VestingFirstAnniversaryMember" name="VestingFirstAnniversaryMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="sncr_VestingMonthlyContinuousServiceMember" name="VestingMonthlyContinuousServiceMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="sncr_VestingSecondAnniversaryMember" name="VestingSecondAnniversaryMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="sncr_VestingMonthlyContinuousServiceAfterSecondAnniversaryMember" name="VestingMonthlyContinuousServiceAfterSecondAnniversaryMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="sncr_QuarterlyVestingAfterFirstAnniversaryMember" name="QuarterlyVestingAfterFirstAnniversaryMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="sncr_VestingPerformanceGoalAttainedMember" name="VestingPerformanceGoalAttainedMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="sncr_AnnualVestingOfPerformanceAwardsAfterInitialAchievementMember" name="AnnualVestingOfPerformanceAwardsAfterInitialAchievementMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="sncr_NumberOfMonthsOfContinuousService" name="NumberOfMonthsOfContinuousService" nillable="true" type="xbrli:durationItemType" 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" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="sncr_ObligationsUnderAcquisitionAgreementMember" name="ObligationsUnderAcquisitionAgreementMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="sncr_FirstSucceedingFiveYearPeriodMember" name="FirstSucceedingFiveYearPeriodMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="sncr_SecondSucceedingFiveYearPeriodMember" name="SecondSucceedingFiveYearPeriodMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="sncr_SucceedingPeriodAfterTenYearsMember" name="SucceedingPeriodAfterTenYearsMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="sncr_DeferredRevenueMember" name="DeferredRevenueMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="sncr_DeferredTaxAssetsValuationAllowanceAfterTax" name="DeferredTaxAssetsValuationAllowanceAfterTax" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="sncr_TopCustomersMember" name="TopCustomersMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="sncr_DataCenterEquipmentMember" name="DataCenterEquipmentMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="sncr_PropertyPlantAndEquipmentUsefulLifeBeforeChangeInAccountingEstimate" name="PropertyPlantAndEquipmentUsefulLifeBeforeChangeInAccountingEstimate" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="sncr_IncomeTaxAssumptionsHistoricalLookbackPeriod" name="IncomeTaxAssumptionsHistoricalLookbackPeriod" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="sncr_PaymentsForContingentConsideration" name="PaymentsForContingentConsideration" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
</xsd:schema>