[asterisk-bugs] [JIRA] (ASTERISK-23981) [patch]sip.conf progressinband=never does not mean 'never'.

[Rusty Newton (JIRA)]

Rusty Newton created ASTERISK-23981:
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             Summary: [patch]sip.conf progressinband=never does not mean 'never'.
                 Key: ASTERISK-23981
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-23981
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Channels/chan_sip/General
    Affects Versions: 11.10.1
            Reporter: Steve Davies
            Severity: Minor


My understanding of progressinband=never on a SIP device is that it will prevent inband progress if at all possible. The is a simple case I have found where this setting is defeated.

If any one of the dialled target trunks sends a progress message (IAX progress / ISDN progress / SIP 183 Progress) Then this is passed unfiltered to the calling channel, This causes SIP_PROGRESS_SENT to be set, and progressinband is inferred, allowing unwanted early audio.

This is causing a problem with my WebRTC testing as a '183 progress' followed by '200 OK' in a SIP conversation is converted to a 'pranswer' followed by an 'answer' in WebRTC terms and most WebRTC implementations do not yet handle that properly.



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