[Freeswitch-dev] Freeswitch chooses the first codec and ignores the rest

[Anthony Minessale]

We currently only support one codec in 200OK  The workaround for this is to
only offer it PCMU so it has no choice.



On Thu, Sep 19, 2013 at 2:52 PM, Sam Russell <sam.h.russell at gmail.com>wrote:

> I've had a couple of calls recently that have been a little weird -
> here's the scenario:
>
> A (local freeswitch) sends invite with PCMU, PCMA as codecs
>
> B (foreign) sends 200 OK with PCMA, PCMU as codecs
>
> Freeswitch sees the response and sets audio codec to PCMA, but other
> end sends us PCMU (as it was our first choice in this case - sometimes
> they choose a random one that both of us support).
>
> RTP is fine with this - each packet refers to the # of the codec
> (either standard or a reference to an rtpmap from the SDP), but
> freeswitch doesn't like it - it forwards the PCMA from my soft phone,
> but the PCMU coming in from the foreign phone gets dropped by
> freeswitch and doesn't get forwarded onto my soft phone (packet trace
> shows freeswitch being the black hole).
>
> Debug output shows freeswitch setting the audio codec, and I suspect
> this means it then only accepts RTP with that codec, instead of
> handling all codecs that it offered in its invite.
>
> Is this expected behaviour? I went trawling through RFCs yesterday and
> nothing jumped out at me, and I'm seeing this on a couple of call
> managers - also sometimes the other end will send H263+ even though
> both ends offered H264 as preferred, and freeswitch drops this in the
> same manner. I think freeswitch should be handling all codecs that it
> offers, especially for video when it only does pass through, so
> spinning up instances of extra "codecs" shouldn't create much
> overhead.
>
> Sent from my iPhone
>
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-- 
Anthony Minessale II

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