Method of completing a telephone call in a telephone system
Patent 5406616 Issued on April 11, 1995. Estimated Expiration Date: 
February 4, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
February 4, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesMethod for a program-controlled telephone switching system in which performance features relating to the setup of a call connection can be initiated from a subscriber station Method of making call-wait and call-alternation in electronic private branch exchange (EPBX) Authentication system for digital cellular communications Integrated personal/cellular communications system architecture Mobile telephone network structure Patent #: 5333178 InventorAssigneeApplicationNo. 191913 filed on 02/04/1994US Classes:455/433, Home location registration (HLR) or visitor location registration (VLR) detail380/46, Nonlinear (e.g., pseudorandom)455/412.2, Having message notification455/414.1, Special service455/458Specific paging techniqueExaminersPrimary: Kuntz, CurtisAssistant: Cumming, William Attorney, Agent or FirmForeign Patent References
International ClassesH04M 011/00H04L 009/00 Foreign Application Priority Data1993-02-05 SEAbstractA method of effecting automatic callback in a mobile telecommunication system. A calling subscriber is permanently connected to a public switched telephone network and a called subscriber is a mobile unit which moves in the public land mobile network. A centrally located home location register keeps an account of where all mobiles registered in the mobile telecommunication network are located, with the aid of local databases, so-called visitor location registers. The called subscriber calls the called subscriber and finds that the subscriber is busy. The calling subscriber then dials a code, wherewith a reference is stored in a queue in the home location register, this queue relating to the called subscriber. When the called subscriber is free to receive a call, the calling subscriber is informed to this effect. The calling subscriber then lifts his telephone receiver and a connection is set-up between the two subscribers. When the called subscriber answers, the call is considered to have been connected. The home location register (HLR) then removes the reference from the queue.Other References
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