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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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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:


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