Patent ReferencesEmergency cellular radiotelephone and method therefor Private branch exchange capable of adding a calling station ID number to the call signal Method for handling calls to a non-registered mobile subscriber in a mobile telephone system Emergency wireless telephone and control system, and method Communication method and apparatus for providing terminal information to a line connected to plural networks Emergency call back using MSC numbers Patent #: 5689548 InventorsAssigneeApplicationNo. 662568 filed on 06/11/1996US Classes:455/404.1, Emergency or alarm communication379/37, EMERGENCY OR ALARM COMMUNICATIONS (E.G., WATCHMAN'S CIRCUIT)455/433Home location registration (HLR) or visitor location registration (VLR) detailExaminersPrimary: Urban, Edward F.Assistant: Nguyen, Tan T. International ClassH04Q 007/22AbstractA method for operating a wireless telephone system to provide emergency service for a wireless telephone operating in the wireless telephone system. In the present invention, the wireless telephone system receives a request to connect the wireless phone to a predetermined telephone number from the wireless telephone. The telephone system then queries the wireless telephone for a unique identifying number identifying the wireless telephone. The unique identifying number enables the wireless telephone system to connect the wireless telephone to the wireless telephone system. The wireless telephone system maintains a set of direct inward dialing numbers (DIDs) that are used exclusively for emergency calls. Each of the DID allows a caller outside of the wireless telephone system to direct a call to a telephone within the wireless telephone system. The emergency call is assigned one of these DIDs and that DID is linked to the unique identifying number of the telephone placing the emergency call. The wireless telephone is then connected to an emergency operator and the emergency operator is given the assigned DID. The DID enables a call from the emergency operator to the wireless telephone through the wireless telephone system. In one embodiment of the present invention, the DID assigned to the wireless telephone also identifies the antenna closest to the wireless telephone. The assignment between the DID and the unique identifying number is terminated after a predetermined period of time which may be altered by the caller or those servicing the emergency call.Field of SearchEMERGENCY OR ALARM COMMUNICATIONS (E.G., WATCHMAN'S CIRCUIT)Central office responsive to emergency call or alarm (e.g., "911", operator position display) Called line or station condition responsive (e.g., recall if busy) MULTI-LINE OR KEY SUBSTATION SYSTEM WITH SELECTIVE SWITCHING AND CENTRAL SWITCHING OFFICE CONNECTION With special service RADIOTELEPHONE SYSTEM Caller identification Call diversion Home location registration (HLR) or visitor location registration (VLR) detail Location display | |