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<div class="moz-cite-prefix">On 03/03/2022 09.41, [EXT] Rhys
Hanrahan wrote:<br>
</div>
<blockquote type="cite"
cite="mid:ED652C06-01A3-45B6-B714-ACE9760F0EC3@nexusone.com.au">
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<p class="MsoNormal"><span style="color:black" lang="EN-GB">OK,
I know this might be better served on the rtpengine list but
just wanted to quickly post a debug log incase you get a
chance to take a look overnight (my night hehe).
<a href="https://pastebin.com/iHRQSTuD"
moz-do-not-send="true" class="moz-txt-link-freetext">https://pastebin.com/iHRQSTuD</a><o:p></o:p></span></p>
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</blockquote>
<p>First off, this does show the "offer" being given to rtpengine
multiple times (with slightly different options) which does
suggest that there are multiple branches, but this alone is not
why you see what you see. The telltale log line is this:</p>
<p>
<blockquote type="cite">Mar 4 01:32:39 sbc5-syd-01
rtpengine[12534]: [1646317959.098841] DEBUG:
[f9d974b1ef245c3384400fa47beee1fb]: enabling passthrough mode<br>
</blockquote>
At this point rtpengine disables all data manipulation (including
SRTP handling) and reverts to dumb UDP forwarding mode. It does
this because in the last "offer" given there was no `ICE=` option
given, and the incoming "offer" had ICE attributes present. I'm
guessing this is a slightly older version of rtpengine (because
newer versions have a saner default behaviour for this case) but
in this case the combination of incoming ICE offer and lack of
`ICE=` option puts rtpengine into "optional ICE relay" mode, which
means it cannot be sure that media will pass through it, requiring
it to fallback to passthrough mode.</p>
<p>Long explanation short: either upgrade, or make sure to always
add an `ICE=` option to your offer flags (either ICE=remove or
ICE=force).</p>
<p>Branch handling should also be addressed but is a separate topic.
If you're doing the branching yourself, usually adding
`via-branch=next` to the offer flags and `via-branch=1` to the
answer flags does the trick.<br>
</p>
<p>Cheers<br>
</p>
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