In recent years, the global IT industry is focusing on NGN (Next Generation Network) ,the governments, the trade associations, the service providers and equipment manufactures are actively participating in research and exploration in NGN.

• NGN(Next Generation Network)即下一代网络，是近年来全球通信产业发展的焦点，国内外的政府部门、行业团体、运营商、设备厂商等都在积极进行着NGN的研究与探索。 NGN网络最大的特点是提供开放式的体系架构和标准的接口，实现了业务与呼叫分离，呼叫与媒体分离；