H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 7/26 (2006.01) H04Q 7/38 (2006.01)
Patent
CA 2102992
- 14- SYSTEM FOR COMPLETING CALLS TO ROAMING CELLULAR TELEPHONE SUBSCRIBERS Abstract Cellular telephone cass are completed to roamers by arranging a Mobile Telephone Switching Office (MTSO) to forward to one or more elements in the Switched Telecommunication Network (STN), such as a centralized database accessible from the switches in the network, information enabling a call to a roaming cellular subscriber to be forwarded to the foreign service area MTSO serving that subscriber, without the need to route the call to the MTSO serving the subscribers home service area. The information provided by the MTSO can be the TDN or other information identifying the telephone number to which calls placed to the roaming cellular subscriber should be completed. The switch utilizing the information from the MTSO is typically the "originating switch" within the LEC or IXC network first receiving the call, but can be any switch within the STN through which calls to the home service area MTSO are routed. The MTSO sending the information is generally the home service area MTSO, but the foreign service area MTSO can alsoperform this function. When calls to the cellular subscriber are received in theswitch, "cellular" calls are differentiated from "other" calls, such as by using the NPA (area code) and/or NXX (telephone exchange) associated with the MTSO. For cellular calls, the database is queried; if the subscriber is roaming, the TDN or other stored information is retrieved and used to route the call through the STN to the foreign service area MTSO, without the necessity of the call being connected to,routed through, or forwarded by, the home service area MTSO. Under certain circumstances, the call can be routed to a wireline telephone. (Fig. 1)
Pehlert William King
Russell Larry Arnise
Sheinbein Daniel
American Telephone And Telegraph Company
Kirby Eades Gale Baker
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