Importance

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Abstract

A wireless communication system constructed according to the present invention includes an originating mobile switching center (MSC), a home location register (HLR), a serving MSC and supporting infrastructure for each MSC. Such supporting infrastructure includes a plurality of base station controllers (BSC) and a plurality of base stations. The base stations support wireless communications within respective cells to service mobile units operating in the cells. When a call is received by the originating MSC intended for the mobile unit, the originating MSC determines whether the call originated from a private branch exchange. Such determination is made based upon whether the call was incoming on a designated trunk line or from a caller ID assigned to the private branch exchange. If the call originated from the private branch exchange, the call is competed and a distinctive ringing is provided to the mobile unit to indicate that the call originated at the private branch exchange. Alternatively, only calls that originated at the private branch exchange are completed to the mobile unit. In determining whether to route calls to the mobile unit, the HLR may investigate the subscriber preferences for the mobile unit.

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First Claim