There is a SIP based multiparty conference with a focus - every participant
is connected using a SIP dialog to a central focus, which mixes/switches
Media sent by the participants.
One of the participants wants the focus to fetch e.g. a picture / an audio
clip from an HTTP server / an RTSP server and play it to the conference
participants using their media streams negotiated in SIP dialogs.
Hope this makes this use case clearer.
So, absolutely no variation on INVITE or UPDATE is reasonable here.
Maybe some sort of new INFO package would work.
Or, a variation of the MEDICATRL approach (focus subscribes to media
control events at UA, receives media control commands as NOTIFY).
Or, a completely non-SIP mechanism.
--
Dean
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