Dale,
UA 1 uses an INVITE with a Join header, to either UA 2 or UA 3, where
the Join header references the dialog id. See RFC 3911.
Paul
Dale R. Worley wrote:
> If I have a UA 1 with dialogs established to UA 2 and UA 3, it is
> well-known how UA 1 can remove itself from the situation and connect UA
> 2 directly to UA 3. (Send to UA 2 a REFER with Refer-To:
> UA-3?Replaces=call-id-with-UA-3.)
>
> But if UA 1 has the dialog identifiers of a dialog between UA 2 and UA
> 3, how does it insert itself into the connection between the two? I
> cannot see how to perform two simultaneous INVITE-with-Replaces
> operations.
>
> Dale
>
>
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