NGN、软交换和IMS的关系

Relationships among NGN,Softswitch and IMS

下一代网络(NGN)是业界的热点话题,其中关于IP多媒体子系统(IMS)、软交换(Softswitch)的定位和未来发展方向需要达成共识。软交换和IMS都是属于NGN的业务网。软交换从设备的实现而言,应该可以平滑演进到IMS,但是从网络的演进而言,由于软交换将主要支持传统的公共交换电话网/综合业务数字网(PSTN/ISDN)业务,而它的基本业务和补充业务都是在本地实现,因此要实现向IMS的平滑演进有一定难度。

When NGN becomes a hot topic in the industry, it is imperative to reach a consensus on positioning I P Multimedia Subsystem （IMS） and Softswitch, and planning their future directions. Both the Softswitch and IMS are adopted in the Next Generation Network （NGN） service layer. The Softswitch equipment can be evolved smoothly to relevant equipment in IMS. However, it is rather difficult to realize smooth network evolution towards IMS as the Softswitch mainly supports the traditional Public Switched Telephone Network/Integrated Services Digital Network （PSTN/ISDN） services, and its basic and complementary services are offered locally.