At present,it has important practical significance to implement the interworking between four kinds of key protocols in softswitch technology for NGN,namely H.323,SIP,MGCP and Megaco(H.248).

• 目前；如何实现下一代网络(NGN)软交换技术中4种关键的协议；即H.；323、会话初始协议(SIP)、媒体网关控制协议(MGCP)和H