Ngn Softswitch Technology, To Interrupt The Call Server Module

With the rapid development of the telecom industry, the traditional telecom concepts and architecture are constantly impacted by Internet technology, which represents the new technologies and theories. The amalgamation of various networks has become the current networks'development trend. At the same time, the increasingly various service requirements urgently need the support of the new technology and network. Under this background, the NGN (Next Generation Network) based on Softswitch technology comes into being and develops rapidly. Softswitch technology combines the characteristics of effective operation and management of the traditional telecom technology and the simple, open and flexible concepts of IP network. The key idea of Softswitch is the separation of service, call controlling and bearer. Through the layered architecture and open interfaces, Softswitch can effectively resolve the evolution and amalgamation problems of existing networks ,also decrease the cost of network. Softswitch can provide new service continuously and make the network operators to gain earnings quickly.As the core equipment of controlling layer of the Softswitch network, Softswitch equipment can provide the function of call controlling, media controlling, service providing, signal interworking and so on. The whole project focuses on how to design and realize the SCST (Softswitch Call Server Trunk). The SCST can provide the Class 4 switch function for various access networks. Also, as a service-providing platform, it works with Service Control Point or Application Server to provide network users with the value-added services.The dissertation starts with the generation of Softswitch, summarizes its concept, idea, application and network architecture, then discusses its protocols such as SIP, H.248/Megaco, SCTP,M3UA, introduces the Intelligent Network. Later it analyses the network applications and function requirements of SCST as a C4 and service-providing platform, designs the total software architecture of SCST, and introduces the function of different sub modules. Then it gives the design scheme of the multi-protocol access module and media-controlling module. After that, the dissertation shows the...