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随着社会不断发展，网络服务不断多 样化，人们可以利用网络干很多事情，如收发信件、家庭办公、Ｖｉｄｅｏ ｏｎｄｅｍａｎｄ、网络电话，这对网络的要求越来越高，有人还不禁提出这样一个想法；能否把这些对带宽、实时性、传输质量粟求各不相同的网络服务由一个统一的多媒体
With the continuous development of society and the continuous diversification of network services, people can use the Internet to do many things, such as sending and receiving letters, home office, Video ondemand and Internet telephony, which are increasingly demanding on the Internet. Some people can not help but come up with such an idea ; Can these different bandwidth, real-time, quality of transmission Su milky network services from a unified multimedia