<div dir="ltr">We currently only support one codec in 200OK The workaround for this is to only offer it PCMU so it has no choice.<div><br></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Thu, Sep 19, 2013 at 2:52 PM, Sam Russell <span dir="ltr"><<a href="mailto:sam.h.russell@gmail.com" target="_blank">sam.h.russell@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I've had a couple of calls recently that have been a little weird -<br>
here's the scenario:<br>
<br>
A (local freeswitch) sends invite with PCMU, PCMA as codecs<br>
<br>
B (foreign) sends 200 OK with PCMA, PCMU as codecs<br>
<br>
Freeswitch sees the response and sets audio codec to PCMA, but other<br>
end sends us PCMU (as it was our first choice in this case - sometimes<br>
they choose a random one that both of us support).<br>
<br>
RTP is fine with this - each packet refers to the # of the codec<br>
(either standard or a reference to an rtpmap from the SDP), but<br>
freeswitch doesn't like it - it forwards the PCMA from my soft phone,<br>
but the PCMU coming in from the foreign phone gets dropped by<br>
freeswitch and doesn't get forwarded onto my soft phone (packet trace<br>
shows freeswitch being the black hole).<br>
<br>
Debug output shows freeswitch setting the audio codec, and I suspect<br>
this means it then only accepts RTP with that codec, instead of<br>
handling all codecs that it offered in its invite.<br>
<br>
Is this expected behaviour? I went trawling through RFCs yesterday and<br>
nothing jumped out at me, and I'm seeing this on a couple of call<br>
managers - also sometimes the other end will send H263+ even though<br>
both ends offered H264 as preferred, and freeswitch drops this in the<br>
same manner. I think freeswitch should be handling all codecs that it<br>
offers, especially for video when it only does pass through, so<br>
spinning up instances of extra "codecs" shouldn't create much<br>
overhead.<br>
<br>
Sent from my iPhone<br>
<br>
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</blockquote></div><br><br clear="all"><div><br></div>-- <br>Anthony Minessale II<br><br>FreeSWITCH <a href="http://www.freeswitch.org/">http://www.freeswitch.org/</a><br>ClueCon <a href="http://www.cluecon.com/">http://www.cluecon.com/</a><br>
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