[asterisk-bugs] [JIRA] (ASTERISK-30162) when chan_iax is used to relay calls, no ringing indication is played

[Jaco Kroon (JIRA)]

Jaco Kroon created ASTERISK-30162:
-------------------------------------

             Summary: when chan_iax is used to relay calls, no ringing indication is played
                 Key: ASTERISK-30162
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-30162
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Channels/chan_iax2
    Affects Versions: 18.13.0
            Reporter: Jaco Kroon
            Severity: Major


simplest reproduction:

d1 <= SIP => a1 <= IAX/2 => a2 <= SIP => d2.

d1 sends INVITE to a1 (to connect with d2).
a1 sends back 100 Trying.
a1 sends IAX/2 call establishment to a2
a2 acks this.
a2 generates INVITE to d2.
d2 responds with 100 Trying
d2 sends 180 Ringing.
a2 sends RINGING indication to a1.
a1 drops RINGING indication.

This seems to happen because at the time RINGING is sent, no media is established, and as such the frame is dropped due to no compatible media.

Issue introduced by 1b62831f2cfe5dcaa519885dd96b645fc05728e7 (as far as I can tell).

We do use IAX/2 Jitter Buffer, not sure if this happens without JB.

https://gerrit.asterisk.org/c/asterisk/+/18689 was already generated.  This does solve the problem, however, as per feedback, the patch may well be incomplete.



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