

<!--XBRL document created with Merrill Bridge Powered by Crossfire 5.10.74.0 -->
<!--Based on XBRL 2.1-->
<!--Created on: 10/31/2014 4:12:37 PM-->
<!--Modified on: 10/31/2014 4:12:37 PM-->
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  <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_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_DebtInstrumentRepurchasePriceAsPercentageOfPrincipalAmountRepurchased" name="DebtInstrumentRepurchasePriceAsPercentageOfPrincipalAmountRepurchased" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="sncr_FiniteLivedIntangibleAssetsAccumulatedTranslationAdjustments" name="FiniteLivedIntangibleAssetsAccumulatedTranslationAdjustments" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" 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" />
</xsd:schema>





