| The standardization process of Next Generation Network (NGN) and the Softswitch-based network evolution are comprehensively introduced. The relationship between Softswitch and IP Multimedia Subsystem (IMS) is discussed. It is emphasized that network evolution should be carried out in a smooth way. This requires new network equipment to be capable of meeting carriers; various demands. Core network equipment should support different traffic flow, multiservice, multiprotocol, and have the advantages of large capacity and high performance. Edge network equipment should have diversified interfaces. Flexible service platforms and new kinds of user-acceptable terminals are favored by carriers for service development and more intelligent network management systems are highly in demand for network management and maintenance。2001year, Next Generation Network (NGN) and softswitch technology has been proposed, but the real promotion and application of nearly two years. As a Next Generation Network (NGN)softswitch network maintenance and optimization engineer, Ⅰ personally experienced and responsible for the completion of the the fixed intelligent renovation project of the branch of China Unicom Alashan League, and experience to the Next Generation Network (NGN) and softswitch technology brings a lot of convenience. Ⅰ more convinced that the child Next Generation Network (NGN) and softswitch technology is bound to usher in a more comprehensive promotion and application in the near future. The author of this article the concept of Next Generation Network (NGN) and softswitch technology, architecture, protocol, status quo and development of understanding and experience, detailed systematic introduction of China Unicom Alashan League branch fixed-line intelligent transformation of the entire process. |