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rsity and was remended for admission to Ji Lin University as a graduate student. My major is munication and information systems and the mainly research field during my postgraduate study is broadband munication network engineer and multimedia munication. From September of 2004 to March of 2005 , there is a cooperation project between our lab and department of Electronic Engineer of Tsinghua University. This project developed a software video conferencing system. In the project , I took charge of the and Potocol . In Sep. 2005, I returned to our lab to the other project which is a video munication system Design a video munication system between PC and PC based on LAN based SIP, I took charge of the SIP signal system of the Project,Until now. At present , I achieved the SIP stack and proxy server,rigester server and UA,SDP body,digest authentication. From March of 2006 to now , I took part in the Bureau Telemunication Ward program as the project director , It is