简要介绍多媒体会议系统的相关国际标准 ,重点分析多媒体会议数据协议体系 T.1 2 0系列 ,其中主要介绍 T.1 2 0系列所包含的具体标准 ,详细分析 T.1 2 0系列协议体系结构和组成协议间的相互关系。在此基础上 ,详细介绍基于 ISDN的多媒体会议系统的组成和在 ISDN上实现 T.1 2 0数据会议系统的具体流程以及计算机会议系统的发展方向。 Brief introduction of multimedia conferencing system related international standards, focusing on analysis of multimedia conferencing data protocol system T.120 series, which mainly introduces the T.120 series contains the specific standards, a detailed analysis of the T.120 series protocol architecture And the composition of the relationship between the agreement. On this basis, it introduces the composition of multimedia conference system based on ISDN and the concrete process of realizing T.120 data conference system on ISDN, and the developing direction of computer conference system.