Videophone, videoconferencing and other conversational multimedia services on fixed bit-rate networks (such as ISDN) depend on the multiplex structure described in Recommendation H. 221.
固定比特率网络（诸如ISDN）上的可视电话、会议电视以及其他会话型多媒体业务依据建议H.221中所描述的多路复用结构。
Videophone, videoconferencing and other conversational multimedia services on fixed bit-rate networks (such as ISDN) depend on the multiplex structure described in Recommendation H. 221.
固定比特率网络（诸如ISDN）上的可视电话、会议电视以及其他会话型多媒体业务依据建议H.221中所描述的多路复用结构。
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