Patent ID: 7627322

Claim:
A method of initializing a call forwarding system wherein a call originally placed to a mobile telephone number of a mobile telephone is forwarded to a landline telephone number of a landline telephone associated in a database with a forwarding location, wherein the call is forwarded when the mobile telephone is approximately at the forwarding location, the call being routed through a telephone network by a service provider, the method comprising: (a) receiving from the landline telephone a set-up telephone call directed to a predetermined number while the mobile telephone is at the forwarding location and is powered on; (b) upon receiving the set-up telephone call, determining the forwarding location using a mobile location technology to locate the mobile telephone using service provider equipment; and (c) creating a record in the database, the record containing the determined forwarding location associated with the landline telephone number; wherein the mobile location technology is a time difference of arrival method having the steps of: (i) receiving a signal of the mobile telephone at a first antenna site having a first receiver, a second antenna site having a second receiver and a third antenna site having a third receiver; (ii) synchronizing the receivers by using a precision standard clock; (iii) determining a first time of arrival (TOA) when the signal reaches the first receiver, a second TOA when the signal reaches the second receiver and a third TOA when the signal reaches the third receiver; (iv) calculating a first time difference between the first TOA and the second TOA, a second time difference between the second TOA and the third TOA, and a third time difference between the third TOA and the first TOA; and (v) generating the current mobile telephone location expressed in longitude and latitude by using a geographic location algorithm, said geographic location algorithm being a function of a known transmission speed of the signal of the mobile telephone, the first, second and third time differences and geographic locations of the first, second and third antenna sites.