[asterisk-bugs] [JIRA] (ASTERISK-27994) early media ringback not indicated after progress() on pjsip channel

[Gregory Massel (JIRA)]

Gregory Massel created ASTERISK-27994:
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             Summary: early media ringback not indicated after progress() on pjsip channel
                 Key: ASTERISK-27994
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-27994
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Channels/chan_pjsip
    Affects Versions: 13.22.0
         Environment: Ubuntu 16.04 LTS, Asterisk 13.22.0, pjproject bundled 2.7.2
            Reporter: Gregory Massel
            Severity: Minor


chan_pjsip doesn't handle early media correctly in all instances.

Specifically, two issues:
1. When the endpoint is configured with "inband_progress = no" (default), chan_pjsip will act as chan_sip used to with progressinband=never, i.e. Even if a Progress() application is run, it will still NOT indicate ringing inband.

e.g. Something like:
exten => s,1,Progress()
same => n,Playtones(!400*33/40,!0/40,!400*33/40,!0/40,!400*33/40,!0/500)
same => n,Wait(0.25)
same => n,StopPlayTones
same => n,Dial(PJSIP/endpoint)

If the dialled endpoint indicates ringing, the calling endpoint hears dead silence (after the initial tones). This is incorrect. The channel driver must provide inband ringing (despite inband_progress=no setting) because the Progress() application has been run and the media stream opened.

chan_sip handles this correctly (if progressinband=no is set); chan_pjsip doesn't.

2. When the endpoint is configured with "inband_progress = yes" and the same dialplan is used, pjsip will issue TWO 183 messages to the calling endpoint, one when the Progress application is run and then a second when it receives a 180 from the dialled endpoint. This is also incorrect because, once an intial 183 has been sent and the media stream is open, no further 183 message should be sent.




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