Patent ID: 8630254

Claim:
A telephone switching system, comprising: a memory storing information associating first, second and third telephone numbers with a single mobile terminal, the first telephone number corresponding to a first telephone network to which the mobile terminal can be connected, the second telephone number corresponding to a second telephone network to which the mobile terminal can be connected, and the third telephone number being a common telephone number for the mobile terminal, and the memory also storing information indicating which of the telephone networks the mobile terminal is presently connected to; an agent computer which, upon receipt of a signal sent via the first telephone network indicating that the mobile terminal is attempting to place a phone call using the second telephone number to a telephone number associated with a third party terminal: looks up the common telephone number in the memory; causes a request to accept a call from the mobile terminal to be sent to the third party terminal using the common telephone number to identify the mobile terminal; causes a request to accept a call to be sent to the mobile terminal using the second telephone number via the second telephone network; causes a connection to be made between the agent computer and the mobile terminal; and if the third party terminal accepts the request, causes a connection to be made between the agent computer and the third party terminal.