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

[Digium Subversion (JIRA)]

     [ https://issues.asterisk.org/jira/browse/ASTERISK-21456?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Digium Subversion closed ASTERISK-21456.
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    Resolution: Fixed
    
> 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
>            Assignee: Joshua Colp
>              Labels: Asterisk12, NewSIP
>
> 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 progress of the transfer using SIP NOTIFY requests
> As well, we need to handle a transfer indication. This should determine if the endpoint is ringing, and if not, transmit a REFER request to the target endpoint. (If ringing, we need to redirect it). This also means processing NOTIFY requests and determining the success/failure of the transfer based on the NOTIFY requests.

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