[asterisk-bugs] [JIRA] (ASTERISK-28659) Video conferences over WebRTC do not work anymore if the caller offers only audio

[nappsoft (JIRA)]

nappsoft created ASTERISK-28659:
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             Summary: Video conferences over WebRTC do not work anymore if the caller offers only audio
                 Key: ASTERISK-28659
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-28659
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Resources/res_pjsip_session
    Affects Versions: 16.7.0
            Reporter: nappsoft


Our WebRTC implementation for video conferences (based on sip.js) was working as expected with Asterisk 16.6.2. We offer 3 modes: audio only (as sender, of course the sender can receive video streams...), audio+video and audio+screen.

With Asterisk 16.7.0-rc1 the implementation stopped working if the sender only offers audio but no video stream. The only thing that differs in the SDP sent by Asterisk is the following line:

a=group:BUNDLE 0

which changed to:

a=group:BUNDLE 0 video-1

I was able to track down the changed behavior to the following commit: https://github.com/asterisk/asterisk/commit/6f0a69c51a25fa63405b991d7c20baa229eef96a

res_pjsip_session: initialize pending's topology to endpoint's 



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