Videophone,videoconferencing and other conversational multimedia services on fixed bit-rate networks (such as ISDN) depend on the multiplex structure described in Recommendation ITU-T H.221.The control channel within this multiplex is the so-called bit-rate allocation signal(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,conveyance of network addresses and use of BAS extension codes.
ITU-T H.242-2009由国际电信联盟 IX-ITU 发布于 2009-03-01。
ITU-T H.242-2009 在中国标准分类中归属于: M36 无线电通信设备。
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