多项选择题
A. programming interface to external applications
B. FXS and FXO port negotiation
C. AutoQos VoIP trust boundaries
D. signaling and device control
E. LLQ for voice and video traffic
F. directory and XML services
多项选择题 WhataretwocomponentsoftheQoSIntegratedServices（IntServ）model？（）
多项选择题 InaVoIPnetwork，whichthreecallsignalingprotocolsaresupportedbytheCiscoCallManagerforcallsetup，callmaintenance，andcallteardown？（）
单项选择题 AcmeCompanyhasseveralofficesaroundthecountry.ThecompanyhasdeployedaVoIPnetworkwithCiscoUnifiedCallManagerinamultisitecentralizedconfigurationbutthereisarequirementtoplaceacallagentatsomeoftheremotesites.WhichIOSgatewayfeatureshouldbedeployedattheremotesitetoenablelocalcallcontrol？（）