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¿µ¹® Ç¥Áظí SYSTEM FOR ESTABLISHING COMMUNICATION BETWEEN AUDIOVISUAL TERMINALS USING DIGITAL CHANNELS UP TO 2Mbit/s
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¿µ¹® ³»¿ë¿ä¾à Videophones, videoconferencing and other conversational multimedia services on fixed bit0rate networks depend on the multiplex structure described in ITU-T Rec. H.221. The control channel within this multiplex is the so-called BAS position in each frame. This Recommendation describes all the point-to-point procedures involving the BAS codes: initial capability exchange and mode initialization, including restricted-network operation; in-session mode switching, including audiovisual mode changes and activation of data channels; other procedures, including single/multiple channel interconnection, encryption, mode-preference indication, conveying of network addresses and use of BAS extension codes.
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