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1.概述IMS(IP Mutimedia Subsystem)是3GPP在Rel-5版本提出的支持IP多媒体业务的子系统,它的核心特点是采用SIP协议和独立于承载的特性,目前IMS支持2G和3G的移动接入方式。在网络融合的发展趋势下,3GPP、ETSI和ITU-T都在研究基于IMS的网络融合方案,目的是使IMS成为基于SIP会话
1. Overview IMS (IP Mutimedia Subsystem) is a subsystem supported by 3GPP in Rel-5 version supporting IP multimedia services. Its core features are SIP and independent bearer. At present, IMS supports 2G and 3G mobile handsets Into the way. Under the trend of network convergence, 3GPP, ETSI and ITU-T are all studying IMS-based network convergence solutions in order to make IMS a SIP-based session