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H.323 系列标准是基于信包交换网络的多媒体会议标准,它使用TCP/IP协议,在INTERNET/INTRANET中具有广阔的应用前景.该文对H.323标准的实体及其体系结构进行了概要性的介绍,之后给出了基于INTERNET的多媒体会议系统和IP电话系统的组成及原理“,”The H.323 is ITU Ts set of standards for multimedia conferencing over packet based networks. It applies TCP/IP and has a bright prospect. This paper gives an overview of the H.323 set of standards, and then describes the organization and principles of multimedia conferencing and IP telephony systems on the Internet.