The IP Multimedia Subsystem (IMS) proposed by 3GPP embodies an integration of communications network with the Internet technology and a fabrication of Next Generation Network (NGN) with 3G technology. IMS has been widely acknowledged in both telecom and Information Technology (IT) industries as the core technology for Fixed-Mobile Convergence (FMC). In terms of network convergence, IMS integrates Internet IP, Softswitch and cellular core network technologies. With respect to service convergence, it incorporates open Parlay/OSA technology and web services technology. As to management convergence, it combines management and policy control technologies of telecom network and IP network.To cope with a grim challenge from the Internet, all standardization organizations are interacting to push forward the further development of IMS. A common IMS, proxy service and managed P2P service are important subjects for further research.
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