[asterisk-bugs] [JIRA] (ASTERISK-27697) Enable in-dialog NOTIFY on chan_pjsip channels

[Nathan Bruning (JIRA)]

Nathan Bruning created ASTERISK-27697:
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             Summary: Enable in-dialog NOTIFY on chan_pjsip channels
                 Key: ASTERISK-27697
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-27697
             Project: Asterisk
          Issue Type: Improvement
      Security Level: None
          Components: Channels/chan_pjsip
    Affects Versions: 15.3.0
            Reporter: Nathan Bruning
            Severity: Minor


Broadsoft defines a call control protocol using SIP NOTIFY messages, which seems to be widely implemented; we've seen this working on SNOM phones, Yealink phones and Grandstream phones.

For actions like 'answer', the phone needs to know which call to pickup, so the NOTIFY's are sent in-dialog.

This patch adds support to send in-dialog SIP NOTIFY commands on chan_pjsip channels. Similar functionality has recently been added for chan_sip channels (ASTERISK-27461).

We extend res_pjsip_notify to allow for in-dialog messages. A minor addition to res_pjsip is needed in order to fetch the active SIP dialog. 



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