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？（）AH323BUDPCRTPDTCPEMedia 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
H323
B
UDP
C
RTP
D
TCP
E
Media Gateway Control Protocol (MGCP)
F
session initiation protocol (SIP)
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