[asterisk-bugs] [JIRA] (ASTERISK-29520) chan_pjsip: Sometimes no ringback after change of handling 180/SDP in ASTERISK-29105

[Sven Andersen (JIRA)]

Sven Andersen created ASTERISK-29520:
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             Summary: chan_pjsip: Sometimes no ringback after change of handling 180/SDP in ASTERISK-29105
                 Key: ASTERISK-29520
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-29520
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Channels/chan_pjsip
    Affects Versions: 18.5.0
         Environment: Linux/arm
            Reporter: Sven Andersen


ASTERISK-29105 changed the way 180/SDP-responses are handled by chan_pjsip. If there is a SDP, pass 183/SDP and the belonging audio-stream to a-leg instead of just passing 180 without SDP.

This change seems to be problematic in some situations. I digged a "no ringback-tone"-issue down to this change, reverting fixed it.

Calling T-Mobile germany from o2 germany sometimes (~1 out of 5 times) responds with 180/SDP but actually does not send the expected/announced audio-stream. So there is no indication that the remote party is ringing and suddenly the call is established (If the caller waits long enough and does not hang up due to missing ringback). The other 4 of 5 times the response is just 180 without SDP and all is fine.

Can this be made configurable? 

I could try and submit an according patch (though I am not an asterisk/SIP developer or c-expert so don't expect it to be perfect...).



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