下一代NGN网络 IMS的介绍。随着各大运营商开始组建IMS网络，IMS网络的前景越来越好，本文介绍IMS组网的网元，接口以及各种应用。-The Next Generation Network(NGN) s key is IMS.follow the china mobile build the IMS network, IMS will be the major telecom network future.