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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