[Freeswitch-users] rtpmap line missing on answer

[David Ponzone]

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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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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