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Re: [Sip] Asking a B2BUA to add a party

A focus is a standardized form of b2bua, and the conferencing framework provides several ways to ask the focus to add a participant. The SIP-based mechanism involves sending it a REFER. See draft-ietf-sipping-conferencing-framework and draft-ietf-sipping-cc-conferencing.

This, of course, requires that the focus be visible as a focus; i.e., its not a transparent b2bua that happens to have inserted itself on the call path. In those cases, it is nonsensical IMHO to ask it to do something for you, since you dont know its there.

-Jonathan R.

Baniel Uri-CUB001 wrote:

Say a UA A talks with UA B via B2BUA X. A wants to add an additional party, UA C to the call.
A wants to "ask" X to initiate the addition of C to the call. I can think of INFO or NOTIFY (w/ implicit subscription) sent from A to X as the simplest way to trigger the necessary action in X. It might be even the method MESSAGE with some text which is meaningful to X...

Is anyone aware of more "standardize" (but simple) way to accomplish that? In general I am asking about a SIP standardized way for a SIP element A to ask another SIP element B to perform an action, which is related to an existing dialog(s), without the need to use an additional protocol.

Thx
-uri (Baniel)

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Jonathan D. Rosenberg, Ph.D.                   600 Lanidex Plaza
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_______________________________________________
Sip mailing list  https://www1.ietf.org/mailman/listinfo/sip
This list is for NEW development of the core SIP Protocol
Use sip-implementors at cs.columbia.edu for questions on current sip
Use sipping at ietf.org for new developments on the application of sip