Importance

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Abstract

A system for enhanced call delivery to a roaming cellular subscriber, enabling said subscriber to receive calls placed to his MIN in his home system service area, utilizes a central telecommunications system processor capable of handling network applications, directly connected to a plurality of mobile telephone switches located in the service areas of a plurality of cellular telephone systems, each of said switches connected via a direct communication link to said central telecommunications system processor. A plurality of registers in said central telecommunications system processor are provided for storing data bases of system information, individual switch information, and subscriber information. The central telecommunications system processor is programmed to communicate with said switches, and to provide to the switches of the home and visited service areas of a roaming cellular subscriber: (1) making the identity of the current visited system switch of a roaming cellular subscriber known to his home system; (2) establishing financial responsibility of the roaming cellular subscriber; (3) establishing a valid roamer service profile in a visited system; and (4) setting up call delivery to a validated roaming cellular subscriber in the service area of a visited switch. The system further includes a general location register in said central telecommunications system processor containing a data base of all information necessary for validating and locating of known roamers, and a data base of routing information for location of home carriers, whereby end-to-end validation and registration is accomplished for previously unknown roamers. The system provides call delivery information to the home switch of a roamer, routing information for forwarding calls to said roamer; and a temporary directory number as needed for forwarding calls to said roamer over the Public Switched Telephone Network (PSTN).

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First Claim