In a VoIP network， which three call signaling protocols are supported by the Cisco CallManager for call setup， call maintenance， and call teardown？（）
- A、H323
- B、UDP
- C、RTP
- D、TCP
- E、Media Gateway Control Protocol (MGCP)
- F、session initiation protocol (SIP)
正确答案:A,E,F
答案解析:有
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