Study And Implementation Of Videoconference System Based On SIP

H.323 and SIP are the main signaling protocols which control multi-media sessions in a multimedia conference system over the packet network. H.323 is maturer than SIP in application, but SIP is rather simple, flexible, opening and extendable than H.323 which is complicated in implementation and extending and costs much. As soon as SIP is released, it is cared and supported. The research on SIP-based videoconference system also is noticable.This thesis briefly introduces the background and the state of art of SIP and SIP-based conference system, and the overview of concepts, function and feature of SIP, and so on. Then it compares SIP with H.323. RTP/RTCP and SDP are also mentioned, which are refered in this paper.This thesis analyzes the basic content of SIP, discusses its protocol stack and gives a method of implementation. Then it discusses the application of SIP in the multimedia conference, designs the application model of SIP-based videoconference system, and implements the terminal of UA and the control of conference and media and signaling in the core of this system. Finally, the model tested and analysed, a conclusion is drawn which is this model can be used in a project after it is optimized and it can be studied in the future research.