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I wanted to know what the 3G video calling protocol on most mobiles are.. like in Nokia, Sony Erricson , we have "video calling" option built in.. I want to know the details and how such connections are made. Any good whitepaper regarding this?

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http://en.m.wikipedia.org/wiki/3G-324M

3g video call based upon h.324 but it's not VoIP. Technology looks like dying cause low picture quality, resolution and small FPS. Also iOS, Android and Windows Phone doesn't support it.

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None are open yet, as far as I know or can tell, though they will be soon - see FaceTime for example:

http://en.wikipedia.org/wiki/FaceTime

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