目前电信网正向数字化、智能化、综合化和个人化的方向发展。人们对电信网的要求不断提高,而且希望电信网能为用户提供更多、更方便的新业务。为此,ITU-T(国际电联电信部门)提出了B-ISDN(宽带综合业务数字网)的概念。但是,在宽带网络上提供多媒体业务时,不同的多媒体业务都有相应一套各自不同的体系结构和实现方案,因此,开发新业务的投资越来越大,资源 At present, the telecommunication network is developing in the direction of digitization, intelligence, integration and personalization. People are constantly increasing their demands on the telecommunications network, and they hope the telecommunications network can provide users with more and more convenient new services. To this end, ITU-T (ITU Telecommunication Sector) has proposed the concept of B-ISDN (Broadband Integrated Services Digital Network). However, in the provision of multimedia services on broadband networks, different multimedia services have a corresponding set of different architectures and implementation solutions. Therefore, the investment in developing new services is more and more large, and resources