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.

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ESAX字节码根据其句法结构(元素、字符、属性和杂项符号)通过多个复用PPM模型之一进行编码。

The ESAX bytecodes are encoded using one of several multiplexed PPM models based on its syntactic structure (elements, characters, attributes, and miscellaneous symbols).

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为了复用现有的流程及服务构件，必须保证体系结构能适合于定制策略的变更。

To reuse the existing workflow and service artifacts, it is essential that the architecture enables late customization for policy changes.

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