[asterisk-bugs] [JIRA] (ASTERISK-25568) 180 Ringing not sent after 183 Session Progress

[Morten Tryfoss (JIRA)]

Morten Tryfoss created ASTERISK-25568:
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             Summary: 180 Ringing not sent after 183 Session Progress
                 Key: ASTERISK-25568
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-25568
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Channels/chan_sip/General
    Affects Versions: 13.6.0
            Reporter: Morten Tryfoss
            Severity: Minor
         Attachments: chan_sip.patch

We've got a simple scenario with a SIP call through Asterisk.

sip.conf
progressinband=no (default setting)

The remote switch sends a 100 Trying and a 183 Session Progress immediately after we send the INVITE. When the remote destination starts ringing (CPG received on ISUP-side of the switch), the switch sends a 180 Ringing to Asterisk. This is not forwarded to the other side, which I think is wrong.

This can cause lack of ringback tone or wrongly mapped release causes in the originating switch. For example, a 480 temp unavailable is mapped to "20 - subscriber absent" if it has not started to ring, or "19 - no answer from user" if it has.

The attached patch solves the problem for me.



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