Patent ID: 7403517
Filing Date: 2008-07-22
Classification: H04L,H04W

Abstract:
1. A method, comprising: providing interworking between a first wireless telecommunication network and a second wireless telecommunication network, the first wireless telecommunication network and the second wireless telecommunication network being of different network types, wherein one of the first wireless telecommunication network and the second telecommunication network is an Internet protocol based network and the other wireless telecommunication network is a circuit-switched network; registering a dual-mode mobile terminal to one of the first wireless telecommunication network and the second wireless telecommunication network; forwarding a session request received by the first wireless telecommunication network and directed to a terminal unregistered from the first wireless telecommunication network to the second wireless telecommunication network; and checking whether the session request directed to the terminal is a request that can be successfully routed to the second wireless telecommunication network, wherein the forwarding is continued only when the checking determines that the session request can be successfully routed to the second wireless telecommunication network.