SIP gradually becomes the important protocol in the multimedia Softswitch system and 3g multimedia subsystem area of the next generation network (NGN).
SIP协议已逐步成为下一代网络(NGN)的多媒体软交换系统和第三代移动通信(3 G)多媒体子系统域中的重要协议。
Softswitch provides its network capability for Application Server through the service switch subsystem, gives strong support for developing multimedia services.
软交换通过业务交换子系统，向业务平台充分提供其自身的网络能力，对多方多媒体业务的开发提供强大支持。
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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