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 1.H.320/H.323
Sets of widely-used CCITT video compression standards describing methods to allow video conferencing systems from different manufacturers to interoperate. They include a number of individual recommendations for coding, framing, signaling and establishing connections. Three audio algorithms, G.721, G.722 and G.728, are also included in the standards.
 2.What is Videoconferencing?
Communication across long distances with video and audio contact that may also include graphics and data exchange. Digital video transmission systems typically consist of camera, codec (coder-decoder), network access equipment, network, and audio system.
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