Relationships among NGN,Softswitch and IMS
XU He-yuan · ZTE communications · 2006
When NGN becomes a hot topic in the industry, it is imperative to reach a consensus on positioning IP 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.