IP multimedia Subsystem (IMS) is a set of specifications that describes the Next Generation Networking (NGN) architecture for implementing IP based telephony and multimedia services.
IP多媒体子系统(IMS)是一组规范，描述用于实现基于IP的电话和多媒体服务的下一代网络(NGN)体系结构。
SIP is the foundation of the next generation telecommunications networks, called the IP Multimedia Subsystem (IMS).
SIP是被称为IP多媒体子系统(IMS)的新一代电信网络的基础。
The evolution from fixed Softswitch to IP Multimedia Subsystem (IMS) requires reasonable methods, steps and strategies.
固网软交换向IP多媒体子系统（IMS）演进应采用合理的方法、步骤和策略。
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