I thought that SIP was a voice ONLY specification and that the reasoning behind the development of SIP was to do purely voice to avoid what has happened in H.323, the H.323 protocol specification grew to try and be everything to everyone (Voice, Video and Data Sharing) and so became very complex and bloated..SIP basically just gets two parties connected. Whether they then exchange audio, video or whatever is largely irrelevant. The only medium dependant thing I can think of in SIP is codec negotiation. Video doesn't bloat SIP at all.
I may be wrong on this..
Actually H.323 isn't that bloated - it just uses ASN.1 which most people think is a PITA :-(
Regards, Steve
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