多选题In a VoIP network， which three call signaling protocols are supported by the Cisco CallManager for call setup， call maintenance， and call teardown？ （）AH·323BUDPCRTPDTCPEMedia Gateway Control Protocol （MGCP）Fsession initiation protocol （SIP）
多选题
In a VoIP network， which three call signaling protocols are supported by the Cisco CallManager for call setup， call maintenance， and call teardown？ （）
A
H·323
B
UDP
C
RTP
D
TCP
E
Media Gateway Control Protocol （MGCP）
F
session initiation protocol （SIP）
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