Network architecture based on IMS can fulfill the access requirement of fixed network and the service requirement of future network

which plays a vital role in the fixed mobile convergence at core service control layer and supports multiple service of high layer

so 3GPP IMS represents the development direction of future next generation network. This paper introduces the network structure and core components of Nortel networks NGN solution. Furthermore

we analyze the interworking capability and service application of succession IMS in detail.