Patent ID: 6751204
Filing Date: 2004-06-15
Classification: H04L,H04Q,H04W

Abstract:
A method in a third generation Internet Protocol (3G.IP) network of routing a call from an originating subscriber in an originating network to a mobile terminating subscriber roaming in a visited network, said mobile terminating subscriber having a home network that maintains location information for the mobile terminating subscriber, the visited network including a media gateway (MGW1) and a Mobile Switching Center (MSC) Server, and the originating network including a media gateway (MGW2) and an Originating Media Gateway Control Function (O-MGCF), said method comprising the steps of:sending a call origination message from the originating subscriber to the originating network; obtaining location information for the mobile terminating subscriber in the visited network, said location information being obtained by the originating network from the home network; sending a call setup message from the originating network to the visited network, said call setup message being addressed to the location obtained for the mobile terminating subscriber in the visited network, and the step of sending a call setup message from the originating network to the visited network including sending an Initial Address Message (IAM) from the O-MGCF to the MSC Server and including a routing number for the mobile terminating subscriber; sending from the visited network directly to the originating network, an IP address for a node serving the mobile terminating subscriber in the visited network; and routing the call directly from the originating network to the visited network.