Standards for Videoconferencing  

作　　者：Sun Mingjun~1 Sun Zhibin~2(1.China Academy of Telecommunications Research of MII,Beijing 100083,China 2.Multimedia System Department of ZTE Corporation,Baijing 100085,China) 

出　　处：《ZTE Communications》2004年第2期26-29,共4页中兴通讯技术（英文版）

摘　　要：This paper analyzes three standards for videoconferencing and forecasts their development trends.It is concluded that ITU standard H.320 can only videoconferencing involving a few participants while unable to be expanded to interactive multimedia communication platform for multi-applications; H.323 is an open standard system developed under the consideration of both the traditional PSTN call procedure and the characteristics of IP network,and represents a general trend of the development of multimedia telecom services;Session Initiation Protocol (SIP) has good flexibility,scalability and cross-platform compatibility.This paper analyzes three standards for videoconferencing and forecasts their development trends.It is concluded that ITU standard H.320 can only videoconferencing involving a few participants while unable to be expanded to interactive multimedia communication platform for multi-applications; H.323 is an open standard system developed under the consideration of both the traditional PSTN call procedure and the characteristics of IP network,and represents a general trend of the development of multimedia telecom services;Session Initiation Protocol (SIP) has good flexibility,scalability and cross-platform compatibility.

关 键 词：ITU Standards for Videoconferencing IETF PSTN NGN MCU ISDN 

分 类 号：TN919.8[电子电信—通信与信息系统]