Based On Peer-to-peer IP Telephony Research

With the constant development of IP t echnique and the appearance of VOIP in recent years,the data network communication has involved traditional voice business.Due to the large market potential and expansive development future of the mergence of traditional voice business and data business,the development of VOIP technique will also has alarge development space and development potential.Recently,SIP based Internet phone system in VOIP technology of ten has a C/S mode.Although this architecture is simple,it has too much limitations.The Server in this mode is expensive and hard to maintain or upgrade,and it will obviously become the bottleneck of the system.,peer-to-peer(P2P) systems are a kind of distributed system,which is inherently scalable and without centralized Server.They have no such problems as bottleneck or Server maintenance,and inherently have high scalability,robustness and fault tolerance because there is no centralized Server and the network self-organizes it self.Therefore,it is very important and practical to take the advantage of both SIP and P2P network to construct a totally new VOIP network architecture.The article mainly makes a research on the new network system-P2 PS IP Internet Phone based on P2P network architecture and SIP standard.It takes advantages of both P2P system and SIP standard and points out a new direction f or VOIP development.In the article,we make a deep research on its related techniques,then design and re alize the solution of P2PSIP-based Internet phone system.The related techniques include source management in P2P network,the definition and implementation of SIP standard,analysis SKYPE,etc.The result of the research has both theoretic and practical meaning for P2P networkarchitecture and SIP standard.