Bug#980571: jami-daemon: [patch] Get SIP calls to Zoom working

[Petter Reinholdtsen]

With the previously provided patch, SIP calls to Zoom would get video
but no audio.  The trigger for the audio issue was found yesterday, and
is the Zoom use of SILC Opus frames in the audio, which is not supported
by the ffmpeg version used.

A Jami patch to to modify its embedded ffmpeg copy is available from
<URL: https://review.jami.net/c/ring-daemon/+/16892 >, and a the ffmpeg
issue is <URL: https://trac.ffmpeg.org/ticket/4641 > which was fixed 3
months ago.

Any hope to get Jami in Debian Bullseye to work with Zoom before the
freeze?  Am I correct in I assuming it is not using the embedded ffmpeg
source, and the fix need to go in the ffmpeg package?

A quick workaround to get Zoom audio working with Jami is to disable
Opus audio in the GUI.  This way Jami and Zoom negotiate to use another
audio codec and the problem is avoided.

With that in place, the only remaining issue with Jami and Zoom is that
the SIP endpoint in Zoom have no implementation for receiving dial tone
input, so no way to interact with the session to enter passcode, meeting
ID or unmute oneself.  This unfortunately need to be solved on the Zoom
end, I suspect.

-- 
Happy hacking
Petter Reinholdtsen