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).

• 摘要目前，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