多项选择题
A.IP
B.TCP
C.RTP
D.UDP
E.H323
F.CRTP
单项选择题 WhichstatementistrueaboutthedistributedcallcontrolinaVoIPnetwork？（）
单项选择题 WhatisthepurposeoftheNBARprotocoldiscovery？（）
单项选择题 AcmeCompanyhasseveralofficesaroundthecountry.ThecompanyhasdeployedaVoIPnetworkwithCiscoUnifiedCallManagerinamultisitecentralizedconfigurationbuttheisarequirementtoplaceacallagentatsomeoftheremotesites.WhichIOSgatewayfeatureshouldbedeployedattheremotesitetoenablelocalcallcontrol？（）