Research And Realization Of SIP UA With Security Based On Linux Environment

With the commercial revolution of Internet and the continuous development of the network technology, the multimedia communication services, which combine the audio, video, and data together, have been developed rapidly, and get ready to become one of the main business of Next Generation Network. As the core unit of NGN, soft switch became a hot issue of recent researches and applications.SIP will be widely applied in 3GPP, because of its simplicity, flexibility and scalability. But a lack of powerful security mechanism, leads it to face many security threats. Security mechanism of SIP has become another research focus.In this issue, we begin with the research of network infrastructure of SIP communications, structure of SIP message, and the process of registration and session management. Then, analyze system requirements, design the system architecture, and use eXosip and oSIP to develop a more comprehensive IP soft phone.On the other hand, we analyze the existing problems in SIP security and the safety requirements of SIP security mechanism. In order to solve the problems of SIP authentication and information encryption, we proposed an improved method about authentication by involving identity-based encryption to SIP security. IBE is a security mechanism which has simple architecture and is easy to apply. It makes the construction of the system easier. This security method achieved the safety of both authentication and data encryption. At the same time, it meets the safety requirements of SIP to ensure that the integrity, reliability and incontestability in the process of session establishment and message conversation.