[asterisk-bugs] [JIRA] (ASTERISK-26277) Add dialplan function PJSIP_SEND_SESSION_REFRESH that sends a session refresh to update formats on a channel after session establishment

[Matt Jordan (JIRA)]

Matt Jordan created ASTERISK-26277:
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             Summary: Add dialplan function PJSIP_SEND_SESSION_REFRESH that sends a session refresh to update formats on a channel after session establishment
                 Key: ASTERISK-26277
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-26277
             Project: Asterisk
          Issue Type: New Feature
      Security Level: None
            Reporter: Matt Jordan


At a couple of AstriDevCons and - as discussed on the [community forums|https://community.asterisk.org/t/setting-different-codec-for-confbridge/67627/8] - there are times where you may want to change the format on a channel after the session has been established. A couple of use cases for this:
# You may want to switch to a low bandwidth codec due to network congestion issues
# You may want to try and force everyone to a wideband codec, if you know everyone can support it

While {{chan_sip}} makes this a bit difficult, doing it in PJSIP is rather straight forward. The patch referenced in the Gerrit reviews associated with this issue adds a new dialplan function, {{PJSIP_SEND_SESSION_REFRESH}}, that sends a re-{{INVITE}} or {{UPDATE}}. Combined with {{PJSIP_MEDIA_OFFER}}, this allows you to change the formats on the fly.



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