[asterisk-bugs] [JIRA] (ASTERISK-21456) New SIP Channel Driver - add basic REFER support and SIP blind transfers

[Matt Jordan (JIRA)]

Matt Jordan created ASTERISK-21456:
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             Summary: New SIP Channel Driver - add basic REFER support and SIP blind transfers
                 Key: ASTERISK-21456
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-21456
             Project: Asterisk
          Issue Type: New Feature
      Security Level: None
          Components: Channels/chan_gulp
            Reporter: Matt Jordan


Oh boy. Here we go.

REFERs, Replaces, and all the joy they bring.

We need to be able to:
* Receive and authenticate a REFER request.
* Use the bridging API's blind transfer function and blind transfer the channel to either an extension or into a new bridge (or parking lot, etc.)
* Convey success/failure using SIP NOTIFY requests

As well, we need to handle a transfer indication. This should determine if the location is in dialplan, and if not, transmit a REFER request to the target endpoint. This also means processing NOTIFY requests and determining the success/failure of the transfer based on the NOTIFY requests.

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