System and method of providing group wireless extension phone service in a radio telecommunications network

A system in a radio telecommunications network for providing group extension phone service to a plurality of subscribers utilizing standard wireline telephones, said system comprising:

• a mobile switching center/visited location register (MSC/VLR) in said radio telecommunications network, said MSC/VLR serving a geographic area in which said plurality of subscribers are located;
• a subscriber terminal for interfacing said plurality of standard wireline telephones with said radio telecommunications network;
• and
• a base station connected to said serving MSC/VLR for providing a radio link between said radio telecommunications network and said subscriber terminal.

A radio telecommunications network for providing group extension phone service to a plurality of subscribers utilizing standard wireline telephones, said network comprising:

• a gateway mobile switching center (G-MSC) connected to an external communication network;
• a home location register (HLR) connected to said G-MSC, said HLR including a database of directory number (DN) categories;
• a serving mobile switching center/visited location register (MSC/VLR) connected to said HLR, said serving MSC/VLR including a plurality of cellular trunks in a pool configuration;
• a base station connected to said serving MSC/VLR;
• and
• a multi-line terminal (MLT) for connecting said plurality of standard wireline telephones to said base station.

A radio telecommunications network for providing group extension phone service to a plurality of subscribers utilizing standard wireline telephones, said network having a serving mobile switching center/visited location register (MSC/VLR) providing radio telecommunication services to said plurality of subscribers, said network comprising:

• a gateway mobile switching center (G-MSC) connected to an external communication network;
• a home location register (HLR) connected to said G-MSC and said MSC/VLR;
• a first database connected to said serving MSC/VLR which associates a dialed directory number (DN) having a fixed private branch exchange (PBX) category with a mobile identification number (MIN), associates a plurality of cellular trunks with the MIN, and identifies which of said plurality of cellular trunks are idle;
• a base station connected to said serving MSC/VLR;
• and
• a multi-line terminal (MLT) identified by said MIN, said MLT providing a radio link from said plurality of standard wireline telephones to said base station.