Symptom

CUBE received INVITE with G.723 and send out INVITE with G.729 incorrectly. SDP of the incoming INVITE m=audio 6000 RTP/AVP 8 0 4 101 a=rtpmap:8 PCMA/8000 a=rtpmap:0 PCMU/8000 a=rtpmap:4 G723/8000 a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-16 a=ptime:20 SDP of the outgoing INVITE m=audio 26788 RTP/AVP 8 0 18 101 a=rtpmap:8 PCMA/8000 a=rtpmap:0 PCMU/8000 a=rtpmap:18 G729/8000 a=fmtp:18 annexb=no a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-15 a=ptime:20 the following voice class is configured under both incoming and outgoing dial peer. voice class codec 1 codec preference 1 g711alaw codec preference 2 g711ulaw codec preference 3 g722-64 codec preference 4 g729r8 codec preference 5 ilbc codec preference 6 clear-channel

Conditions

voice-class codec which not include G.723 is configured on both incoming and outgoing dial peer

Workaround

Further Problem Description