Design And Realization Of SIP Server And Multi-Domain Security In IMS

Currently, along with the increasing of communication ability and application, IMS is becoming a hotspot in multi-domain integration. The focus is on the following aspects, how to integrate mobile network and fixed network in core network. which include hardware, software and network framework which are needed in application. Even include secure computation platform. With the trend of network integration, IMS technology is the base of integration between fixed network and mobile network based on IP mechanism, and it is considered to a very important stage in network evolvement. IMS technology has already become universal platform based SIP, so it has to sustain multiplication connection model, implement integration of fixed network and mobile network.This paper realized P-CSCF server in IMS following R5 standard, which is comparatively mature nowadays. And this paper also focused on security aspect brought by integration between multi-IMS-domain.The details work included:1) Expatiating IMS structure in detail, especially on SIP protocol and related aspects.2) Describing SIP protocol structure in IMS.3) Based on (1) and (2), and my company, this paper accomplished the P-CSCF server in IMS.4) After the research on IMS security requirement and SIP security, this paper advise a MUTI-DOMAIN security scheme, it has a good deal with UA resource limited, and security development trend, increasing IMS's security adaptability.