多项选择题
A. link efficiency
B. admission control
C. classification and marking
D. shaping and policing
E. congestion avoidance using the RTP protocol
F. resource reservation using the RSVP protocol
多项选择题 InaVoIPnetwork，whichthreecallsignalingprotocolsaresupportedbytheCiscoCallManagerforcallsetup，callmaintenance，andcallteardown？（）
单项选择题 AcmeCompanyhasseveralofficesaroundthecountry.ThecompanyhasdeployedaVoIPnetworkwithCiscoUnifiedCallManagerinamultisitecentralizedconfigurationbutthereisarequirementtoplaceacallagentatsomeoftheremotesites.WhichIOSgatewayfeatureshouldbedeployedattheremotesitetoenablelocalcallcontrol？（）
单项选择题 UsingtheG.729codecandthedefaultcRTPconfiguration，whatistheapproximateVoIPbandwidthsavingsacrossaFrameRelaylinkthataddsa6byteframeheader？"（）