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      <link:linkbaseRef xlink:type="simple" xlink:href="ctct-20111231_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:title="Calculation Links, all" />
      <link:linkbaseRef xlink:type="simple" xlink:href="ctct-20111231_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:title="Definition Links, all" />
    </appinfo>
  </annotation>
  <import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd" />
  <import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" />
  <import namespace="http://www.xbrl.org/dtr/type/numeric" schemaLocation="http://www.xbrl.org/dtr/type/numeric-2009-12-16.xsd" />
  <import namespace="http://www.xbrl.org/dtr/type/non-numeric" schemaLocation="http://www.xbrl.org/dtr/type/nonNumeric-2009-12-16.xsd" />
  <import namespace="http://fasb.org/us-types/2011-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2011/elts/us-types-2011-01-31.xsd" />
  <import namespace="http://fasb.org/us-gaap/2011-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd" />
  <import namespace="http://xbrl.sec.gov/dei/2011-01-31" schemaLocation="http://xbrl.sec.gov/dei/2011/dei-2011-01-31.xsd" />
  <import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd" />
  <import namespace="http://xbrl.sec.gov/country/2011-01-31" schemaLocation="http://xbrl.sec.gov/country/2011/country-2011-01-31.xsd" />
  <import namespace="http://xbrl.sec.gov/stpr/2011-01-31" schemaLocation="http://xbrl.sec.gov/stpr/2011/stpr-2011-01-31.xsd" />
  <!-- elements -->
  <element name="DocumentAndEntityInformationAbstract" id="ctct_DocumentAndEntityInformationAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" abstract="true" nillable="true" />
  <element name="CapitalizationOfStockBasedCompensation" id="ctct_CapitalizationOfStockBasedCompensation" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" />
  <element id="ctct_StockholdersEquityAndStockBasedAwardsAbstract" name="StockholdersEquityAndStockBasedAwardsAbstract" abstract="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_StockholdersEquityAndStockBasedAwardsTextBlock" name="StockholdersEquityAndStockBasedAwardsTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_ComputerEquipment" name="ComputerEquipment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" />
  <element id="ctct_PropertyAndEquipmentTextualAbstract" name="PropertyAndEquipmentTextualAbstract" abstract="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_RetiredAssetsGross" name="RetiredAssetsGross" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="ctct_RetiredAssetsNet" name="RetiredAssetsNet" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="ctct_NutshellMailMember" name="NutshellMailMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_BantamNetworksMember" name="BantamNetworksMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_GoodwillAndAcquiredIntangibleAssetsTextualAbstract" name="GoodwillAndAcquiredIntangibleAssetsTextualAbstract" abstract="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_PropertyAndEquipmentEstimatedUsefulLivesOfAssetsAbstract" name="PropertyAndEquipmentEstimatedUsefulLivesOfAssetsAbstract" abstract="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_SummaryOfSignificantAccountingPoliciesTextualAbstract" name="SummaryOfSignificantAccountingPoliciesTextualAbstract" abstract="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_MarketableSecuritiesInvestmentsMaturityPeriodTreasuryNotesAndAgencyBondsWithFairValue" name="MarketableSecuritiesInvestmentsMaturityPeriodTreasuryNotesAndAgencyBondsWithFairValue" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <element id="ctct_AcquisitionsTextualAbstract" name="AcquisitionsTextualAbstract" abstract="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_ProFormaNetIncomePerShareAbstract" name="ProFormaNetIncomePerShareAbstract" abstract="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_MaximumPercentageOfEmployeeCompensationForHundredPercentContributionAsEmployerContribution" name="MaximumPercentageOfEmployeeCompensationForHundredPercentContributionAsEmployerContribution" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_MaximumPercentageOfEmployeeCompensationForFiftyPercentContributionAsEmployerContribution" name="MaximumPercentageOfEmployeeCompensationForFiftyPercentContributionAsEmployerContribution" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_BasisOfPresentationPolicyTextBlock" name="BasisOfPresentationPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_FairValueOptionForFinancialAssetsAndFinancialLiabilitiesPolicyTextBlock" name="FairValueOptionForFinancialAssetsAndFinancialLiabilitiesPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_NewAccountingGuidancePolicyTextBlock" name="NewAccountingGuidancePolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_MaximumMaturityPeriodForHighlyLiquidInvestments" name="MaximumMaturityPeriodForHighlyLiquidInvestments" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_MaturityPeriodForMarketableSecuritiesClassifiedAsAvailableForSale" name="MaturityPeriodForMarketableSecuritiesClassifiedAsAvailableForSale" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <element id="ctct_EstimatedUsefulLivesOfAssetsTableTextBlock" name="EstimatedUsefulLivesOfAssetsTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_MinimumPercentageOfProbabilityOfRealizingBenefitUponUltimateSettlement" name="MinimumPercentageOfProbabilityOfRealizingBenefitUponUltimateSettlement" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_AccruedLicensedSoftwareAndMaintenanceCurrent" name="AccruedLicensedSoftwareAndMaintenanceCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" />
  <element id="ctct_PercentageOfEmployerContributionUpToThreePercentOfEmployeeCompensation" name="PercentageOfEmployerContributionUpToThreePercentOfEmployeeCompensation" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_PercentageOfEmployerContributionInExcessOfThreePercentOfEmployeeCompensation" name="PercentageOfEmployerContributionInExcessOfThreePercentOfEmployeeCompensation" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_SavingsPlanTextualAbstract" name="SavingsPlanTextualAbstract" abstract="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_NumberOfCustomersAccountedForMoreThanSpecifiedPercentageOfRevenue" name="NumberOfCustomersAccountedForMoreThanSpecifiedPercentageOfRevenue" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <element id="ctct_MinimumPercentageOfRevenueForSignificantCustomers" name="MinimumPercentageOfRevenueForSignificantCustomers" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <element id="ctct_StockOptionActivityAbstract" name="StockOptionActivityAbstract" abstract="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_StockholdersEquityAndStockBasedAwardsTextualAbstract" name="StockholdersEquityAndStockBasedAwardsTextualAbstract" abstract="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_MarketValueOfCommonStock" name="MarketValueOfCommonStock" type="num:perShareItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_CommonStockCapitalSharesAvailableForFutureIssuance" name="CommonStockCapitalSharesAvailableForFutureIssuance" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <element id="ctct_TwoThousandElevenStockIncentivePlanMember" name="TwoThousandElevenStockIncentivePlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_EmployeeMember" name="EmployeeMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_IncomeTaxesTextualAbstract" name="IncomeTaxesTextualAbstract" abstract="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_ResearchAndDevelopmentMember" name="ResearchAndDevelopmentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_TaxCreditCarryforwardAbstract" name="TaxCreditCarryforwardAbstract" abstract="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_OperatingLossCarryforwardAbstract" name="OperatingLossCarryforwardAbstract" abstract="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsAbstract" name="EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsAbstract" abstract="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_MaximumPercentageOfFairMarketValueOfPerUnitPurchasePriceOfAwardsGranted" name="MaximumPercentageOfFairMarketValueOfPerUnitPurchasePriceOfAwardsGranted" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_PeriodForRestrictionLapsesOnStockOptionsThereafter" name="PeriodForRestrictionLapsesOnStockOptionsThereafter" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_EffectiveIncomeTaxRateReconciliationImpactOfPermanentDifferences" name="EffectiveIncomeTaxRateReconciliationImpactOfPermanentDifferences" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_PercentageOfClosingMarketPriceOfCommonStockEqualsToPerSharePurchasePriceForOfferings" name="PercentageOfClosingMarketPriceOfCommonStockEqualsToPerSharePurchasePriceForOfferings" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_TwoThousandSevenEmployeeStockPurchasePlanMember" name="TwoThousandSevenEmployeeStockPurchasePlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_NumberOfShareOfCommonStockForEachRestrictedStockUnit" name="NumberOfShareOfCommonStockForEachRestrictedStockUnit" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_SalesAndSupportOfficeMember" name="SalesAndSupportOfficeMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_TimePeriodForExtensionOption" name="TimePeriodForExtensionOption" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_CommitmentsAndContingenciesTextualAbstract" name="CommitmentsAndContingenciesTextualAbstract" abstract="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_NumberOfExtensionOption" name="NumberOfExtensionOption" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_RentBalanceSheetLocationAxis" name="RentBalanceSheetLocationAxis" abstract="true" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_RentBalanceSheetLocationDomain" name="RentBalanceSheetLocationDomain" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_PrepaidExpensesAndOtherCurrentAssetsMember" name="PrepaidExpensesAndOtherCurrentAssetsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_AccruedExpensesMember" name="AccruedExpensesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_ContractualCommitment" name="ContractualCommitment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" />
  <element id="ctct_LetterOfCreditMaintained" name="LetterOfCreditMaintained" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" />
  <element id="ctct_FederalAndStateMember" name="FederalAndStateMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_PropertyPlantAndEquipmentDisposalsNet" name="PropertyPlantAndEquipmentDisposalsNet" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" />
  <element id="ctct_EffectiveIncomeTaxRateProvisionToReturnAdjustments" name="EffectiveIncomeTaxRateProvisionToReturnAdjustments" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_SubsequentEventsTextualAbstract" name="SubsequentEventsTextualAbstract" abstract="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_AcquisitionsAdditionalTextualAbstract" name="AcquisitionsAdditionalTextualAbstract" abstract="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_CommonStockIssuedValuePursuantToVestingOfRestrictedStockUnit" name="CommonStockIssuedValuePursuantToVestingOfRestrictedStockUnit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" />
  <element id="ctct_ConcentrationOfCreditRiskAndSignificantProductsAndCustomersPolicyTextBlock" name="ConcentrationOfCreditRiskAndSignificantProductsAndCustomersPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_InternationalGovernmentBondMember" name="InternationalGovernmentBondMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_PercentageOfRevenueReceivedFromEmailMarketingProduct" name="PercentageOfRevenueReceivedFromEmailMarketingProduct" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_SoftwareAndWebsiteDevelopmentCostMember" name="SoftwareAndWebsiteDevelopmentCostMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_CompanyAndBantamMember" name="CompanyAndBantamMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_AmortizationOfDevelopedTechnologyThatHasNotYetCommenced" name="AmortizationOfDevelopedTechnologyThatHasNotYetCommenced" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" />
  <element id="ctct_EmployeePurchasePlanPeriod" name="EmployeePurchasePlanPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_TimeBasedVestingMember" name="TimeBasedVestingMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_OfficeLeasesMember" name="OfficeLeasesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_HostingFacilitiesMember" name="HostingFacilitiesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_NumberOfVendorsProvideForRelatedServices" name="NumberOfVendorsProvideForRelatedServices" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_HeadquartersOfficeMember" name="HeadquartersOfficeMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_OtherLongTermLiabilitiesMember" name="OtherLongTermLiabilitiesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_PercentageOfRestrictionsLapsesOnStockOptionsAfterOneYearAndQuarterlyThereafter" name="PercentageOfRestrictionsLapsesOnStockOptionsAfterOneYearAndQuarterlyThereafter" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceBasedVestingAxis" name="ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceBasedVestingAxis" abstract="true" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceBasedVestingDomain" name="ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceBasedVestingDomain" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_PerformanceBasedVestingMember" name="PerformanceBasedVestingMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_AggregateIntrinsicValueOfRestrictedStockUnitsVested" name="AggregateIntrinsicValueOfRestrictedStockUnitsVested" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" />
  <element id="ctct_IntrinsicValueOfRestrictedStockUnitsUltimatelyVested" name="IntrinsicValueOfRestrictedStockUnitsUltimatelyVested" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" />
  <element id="ctct_CardstarMember" name="CardstarMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_ExpirationOfLeaseAgreement" name="ExpirationOfLeaseAgreement" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_GeneralOfficeMember" name="GeneralOfficeMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_ShareBasedCompensationArrangementByShareBasedAwardEquityInstrumentsOtherThanOptionsNonvestedNumberExpectedToVest" name="ShareBasedCompensationArrangementByShareBasedAwardEquityInstrumentsOtherThanOptionsNonvestedNumberExpectedToVest" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <element id="ctct_CommonStockIssuedSharesPursuantToVestingOfRestrictedStockUnit" name="CommonStockIssuedSharesPursuantToVestingOfRestrictedStockUnit" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="ctct_EstimatedUsefulLife" name="EstimatedUsefulLife" type="xbrli:decimalItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
</schema>
