Sean,

X-NSE is the Clear Channel codec from Cisco.
I suspect FreeSWITCH does not support it, and as such, it can't be offered to leg B.
Perhaps there is a way to enable in outbound codecs as bypass, but I really doubt so.
Though, you could try to enable late-negotiation where client and gateway will negotiate together.

David Ponzone  Direction Technique
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gsm:   06 66 98 76 34

Service Client IPeva
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Le 20/05/2011 à 20:54, Sean Eichhorn a écrit :

I have a freeswitch system that (for the most part) works flawlessly for me.  However, I need to have an additional rtpmap line in the SDP when a call is answered.
My client sends the following SDP upon answering the call :
   m=audio 17214 RTP/AVP 0 19 101 100
   c=IN IP4 192.168.98.79
   a=rtpmap:0 PCMU/8000
   a=rtpmap:19 CN/8000
   a=rtpmap:101 telephone-event/8000
   a=fmtp:101 0-16
   a=rtpmap:100 X-NSE/8000
   a=fmtp:100 192-194
 
Freeswitch forwards the following SDP to the external gateway :
   m=audio 20654 RTP/AVP 0 19 101
   c=IN IP4 66.223.187.208
   a=rtpmap:0 PCMU/8000
   a=rtpmap:19 CN/8000
   a=rtpmap:101 telephone-event/8000
   a=fmtp:101 0-16
 
The other information appears fine.  Everything works, but my client-side is not receiving the a=rtpmap:100 line.
This issue appears regardless of whether or not I’m in proxy mode, bypass mode, or neither.
 
Using "sip_append_audio_sdp” has no effect on the answering SDP, only the initial offer.
 
Any ideas?
 
Thanks in advance,
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