隨著通信、網絡和多媒體技術的不斷發展，今天的視頻會議系統更多的已采用了
基于IP 網絡的視頻會議系統。本文對基于網絡H.323 視頻會議系統的結構和其中的各部件做了進一步的分析。并詳細說明了該系統中的關鍵技術，特別是服務質量（QoS）問題，對IP 網絡中的QoS 的改善提出了三項措施，其中的安全實時傳輸協議（SRTP）和視頻垃圾檢測對改善QoS 都有較大貢獻。最后，簡要分析了視頻會議系統的數據協議模型。
關鍵詞：多媒體；視頻會議系統；IP 網絡；多點控制單元；數據協議；
Video Conferencing System Based on IP LI-Jing, HUANG-Hua (School of Electrical Engineering and Information Technology, Sichuan University, Chengdu 610065, China) Abstract ： Along with the development of communication, network and multimedia, nowadays, Video Conferencing System has run to the one based on IP network. This paper explains the structure of Video Conferencing System based on H.323 and its components. Moreover, it also introduces the important technologies specially the QoS, this paper gives three methods to improve the QoS in IP network, in which SRTP and Video-Spam Detection are more important. At last, it simply introduces the data protocol model of Video Conferencing System.
Key Words: Multimedia；Video Conferencing System； IP network； MCU；Data Protocol;