Patent ID: 6868272
Filing Date: 2005-03-15
Classification: H04W

Abstract:
1. A method of modifying an existing telephone network, the method comprising coupling interface devices to the telephone network, the interface devices coupled to circuitry coupled to radio transceivers that service mobile subscribers that may be located in ones of various geographic regions, the mobile subscribers each being assigned to a respective geographic region: coupling the interface devices to circuitry that, when a subscriber is located in a region other than a geographic region to which the subscriber is assigned, routes a call with the mobile subscriber through a path including a radio transceiver that serves the region in which the mobile subscriber is currently located and an interface device that serves the region to which the subscriber is assigned: and, wherein the subscriber has a set of directory numbers and each call is associated with at least one directory number, and for a call to the mobile subscriber, the interface devices, upon detecting that the mobile subscriber is located outside the mobile subscriber's home region, route the call depending on instructions in a subscriber service profile, the instructions being associated with the directory number that is associated with the call; and, wherein, for calls with the subscriber located in a region other than the geographic region to which the subscriber is assigned, billing information is passed to the existing network regarding location of the subscriber only through the interface that serves the region to which the subscriber is assigned.