[Freeswitch-users] INCOMPATIBLE_DESTINATION - did FS not offer a codec?

[Michael Collins]

For the record, line #107 contains the codecs (and other stuff) that FS
offered:

m=audio 16480 RTP/AVP 8 0 9 101 13

The "8 0 9 101 13" represent the codecs (and other stuff). What do those
numbers mean? This wiki page has the list:

http://wiki.freeswitch.org/wiki/RTP_payload_list

The SDP spec says that for non-dynamic payload numbers you are NOT required
to have the "a=rtpmap" lines. This makes sense because those payload numbers
don't change meaning until you get up to 96 and higher. The issue is that
some devices are broken and require the "a=rtpmap" lines for the payload
types below number 96. The verbose_sdp chan var mentioned by KK tells FS to
add all those a=rtpmap lines for the non-dynamic payload types. You should
only set this var when absolutely necessary because those verbose SDP's can
cause the packets to be larger than the allowable MTU size.

Dontcha just *love* SIP/SDP interop? :)

-MC

On Tue, Sep 13, 2011 at 8:01 AM, Avi Marcus <avi at avimarcus.net> wrote:

> I see a failed bridge to my second carrier. The  sip_local_sdp_str doesn't
> show PCMU in it - did FS not offer any codecs?
> FS log: http://pastebin.freeswitch.org/17316
> PCAP: http://ge.tt/95tFji7
>
> Can someone tell me what's going on here?
>
> -Avi
>
>
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