Refer to the exhibit. An engineer configures Cisco Unified Border Element to connect the enterprise VoIP network with a SIP telephony provider. Calls are not working in either direction. What must be configured in the dial peer 1 to fix the issue?
C. session-protocol sipv2
The dial peer is configured to handle VoIP traffic, but it is missing a key configuration element: the session protocol. Since this setup is for a SIP telephony provider, the dial peer must explicitly specify that it will use the SIP protocol. The session-protocol sipv2 command will enable SIP for this dial peer.
The answer should be C. The default protocol for a VoIP Dial Peer is H.323 unless the command "session protocol sipv2" is entered in the dial-peer configuration. Codec would determine the RTP/SDP negotiation and the incoming called number and answer address would only determine matching characteristics. The problem is the signaling protocol required by the provider is SIP and its not being used here.
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