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<p>Hello,<br>
</p>
<br>
<div class="moz-cite-prefix">On 07/03/2017 13:10, Grant Bagdasarian
wrote:<br>
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<p class="MsoNormal"><span lang="NL">Hi,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="NL"><o:p> </o:p></span></p>
<p class="MsoNormal">One of our customers is using a SEMS box to
place two outbound calls using our sip trunk.
<o:p></o:p></p>
<p class="MsoNormal">Once the first call is connected a second
call is placed and when the second call answers their server
sends a re-invite to switch audio ports so the rtp traffic
doesn’t flow through their server anymore but is routed inside
our platform.<o:p></o:p></p>
<p class="MsoNormal">Basically, they just switch SDP’s of both
calls. <o:p></o:p></p>
<p class="MsoNormal">It seems like a random issue, and is not
really reproducible, except for placing multiple calls and
sometimes both parties can hear each other, other times they
can’t, because rtpengine fails (I think) to update the
endpoint and keeps sending rtp back to their server for one of
the call legs.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">We tried to reproduce the case using a
freeswitch box and it worked every time. After the reinvite,
the rtp remained within our platform.<o:p></o:p></p>
<p class="MsoNormal">The signaling in both cases still goes
through the freeswitch or sems for call control.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Does anyone have experience with this case?
Or seen the issue before where rtpengine keeps sending rtp to
the original endpoint?<o:p></o:p></p>
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<br>
Have your checked to see if the sip messages are received/processed
in the expected order?<br>
<br>
In some very rare situations, it happened that the re-invite was
sent very fast by callee after just sending the 200ok, so that the
re-invite arrived to the proxy/rtprelay before the 200ok, so at the
end the sdp from 200ok was taken as the last relevant one for the
peer. I put there rtprelay, because I faced this issue where I had
rtpproxy, but maybe the issue is exposed by the rtpengine as well.<br>
<br>
Cheers,<br>
Daniel<br>
<pre class="moz-signature" cols="72">--
Daniel-Constantin Mierla
<a class="moz-txt-link-abbreviated" href="http://www.twitter.com/miconda">www.twitter.com/miconda</a> -- <a class="moz-txt-link-abbreviated" href="http://www.linkedin.com/in/miconda">www.linkedin.com/in/miconda</a>
Kamailio Advanced Training - Mar 6-8 (Europe) and Mar 20-22 (USA) - <a class="moz-txt-link-abbreviated" href="http://www.asipto.com">www.asipto.com</a>
Kamailio World Conference - May 8-10, 2017 - <a class="moz-txt-link-abbreviated" href="http://www.kamailioworld.com">www.kamailioworld.com</a></pre>
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