[SIPForum-discussion] Change the Payload in the SDP from dynamic to standard

[Moy Amiga]

>
> Hi all
>
> We have an issue with the payload for the G.729
>
> My carrier send us the call with the payload 101 for G.729 in the SDP like
> this:
>
> v=0
> o=Sonus_UAC 5078 10327 IN IP4 192.168.1.0
> s=SIP Media Capabilities
> c=IN IP4 192.168.1.1
> t=0 0
> m=audio 10198 RTP/AVP 101 8 0
> a=rtpmap:101 G729/8000
> a=fmtp:101 annexb=no
> a=rtpmap:8 PCMA/8000
> a=rtpmap:0 PCMU/8000
> a=sendrecv
> a=maxptime:20
>
> and the call complete correctly.
>
> but when the UAC need to transfer this call,
> ​the UAC
>  changes the payload to 18 for G729 (and add the DTMF), like this:
>
> v=0
> o=BroadWorks 74714131 4 IN IP4 192.168.2.0
> s=-
> c=IN IP4 192.168.2.1
> t=0 0
> m=audio 26384 RTP/AVP 18 8 0 101
> a=rtpmap:18 G729/8000
> a=rtpmap:8 PCMA/8000
> a=rtpmap:0 PCMU/8000a=rtpmap:101 telephone-event/8000
> a=fmtp:101 0-15
> a=ptime:20
>
>
> *And after this change i don't have audio.*
>
> what is the right thing to do in this case?
>
>
> P.S.
> I see the RTP for the carrier in the wireshark like UNKNOWN...
>
> [image: Imagen integrada 1]
>
> Best regards
>
>
> --
>
> *Moisés Amiga*
>
> *SBC Operation*
>
>
>
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