Design And Implementation Of A SIP-P2P Based Embedded VoIP System

Along With the popularity of Board Band services, IP phone can be developed deeply and used as one of the most important applications over Board Band network, it get the world's attention. Compared with traditional phone, though IP phone have many advantages, it can make the communication of audio,video and data work come ture, and it cost lowly, it's also easy to expand, so the development will lead the revolution of phone network. It is still a little bit complex for people who are used to traditional phone. Beside this, it is also complex for people who do not know PC very well for many IP phone must be operated on PC. So need to make the IP phone more stable and easy to use like traditional phone.SIP(Session Initiation Portocol) is one of the IP technology signaling Protocols. It's proposed by IETF(Internet Engineering Task Force). Based on SIP, combined with traditional voice and its adding value, and by providing the latest real time service and video service over IP network, It has high flexibility and expandability. Just because the series of advantages,SIP is widely used in next generation network. In the current IP Telephone system based on C/S architecture,all users have to register to central server before making any call, so the ability of central server is a bottle-neck of the whole system. P2P overlay makes better use of client node, which improves the loading ability and stability of whole system.Through the research on telephone network technology, introduce the IP phone-related background knowledge, including the basic principles of the IP phone, the using technology, P2P protocol, basic knowledge of SIP signaling and so on. Based on the above theory, raise the conceive of setting up the SIP protocol on the P2P protocol, full use the advantages to meet the needs of the customer's plug-and-play functions; and after the protocol signal test and communication quality test, to ensure that the systems meet the design requirement.After testing, terminal realize the basic requirements of customer, it has stable,simple,friendly, and good compatible.