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IP多媒体子系统(IMS)采用SIP协议进行呼叫控制,与接入无关,支持各种综合业务,因此,ETSI和ITU-T已将其作为NGN的核心结构。首先简要介绍了IMS的网络架构及其特点,分析了基于IMS实现固定移动网络融合的优势,提出了基于IMS的网络融合方案,并指出这种融合方案所面临的问题与挑战。
The IP Multimedia Subsystem (IMS) uses the SIP protocol for call control. It has nothing to do with access and supports various integrated services. Therefore, ETSI and ITU-T have taken it as the core structure of NGN. First of all, it briefly introduced the IMS network architecture and its characteristics, analyzed the advantages of IMS-based fixed mobile network convergence, proposed IMS-based network convergence solution, and pointed out the problems and challenges of this convergence solution.