Hi everybody
My 3620 received a PSTN call and then forwards this to a softswitch. It proposes G.729 as part of the INVITE message:
a=rtpmap:18 G729/8000
The call gets connected and the same codec type is used in this message.
This is the SDP section in message 200:
t=0 0
m=audio 31374 RTP/AVP 18 101
a=rtpmap:18 G729/8000
a=rtpmap:101 telephone-event/8000
But then the router decides to disconnect and send a BYE message.
After debugging with "debug ccsip all" we find some events like:
Dec 12 16:46:06.289 pst: Codec (No Codec ) is not in preferred list
Dec 12 16:46:06.289 pst: Dynamic Payload :101 in SDP Body
Dec 12 16:46:06.293 pst: sipSPIDoAudioNegotiation: No matching voice codec found for m-line 1
We have no problems when using G.711 ulaw.
Any ideas why this fails. This is not a configuration issue; we have the same one in production. We think about a IOS bug or DSP failure.
