When Will IP Videoconferencing Mean SIP Rather Than H.323?

Brent, Kelly, E
April 2004
Business Communications Review;Apr2004, Vol. 34 Issue 4, p32
Trade Publication
The selection of Session Initiation Protocol (SIP) rather than H.323 by Microsoft Corp. for Messenger for Windows XP legitimized SIP for desktop videoconferencing systems, but interoperability remains a major challenge. The details of the SIP-based video implementation of Microsoft remains proprietary and Microsoft will only divulge details to selected partners. Another basic challenge facing SIP in the video market is the lack of an established standard for transmitting video over SIP. SIP has no video specifications, so when a manufacturer states that it uses SIP for video, that only means it uses SIP for signaling which does not imply interoperability with other SIP video clients.


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