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I think H.323 is complex because it requires support for multi point audio/video conferencing.

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Posted by HamidAliKhan

Because H.323 is a binary protocol so its complex.Another reason is it includes a great amount of protocol stacks and also it consists of many header fields.

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Posted by sagitraz

H.323 is complex because it requires support for multipoint audio/video conferencing.

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Posted by waqqas1