Method and apparatus for alerting multiple telephones for an incoming call
Patent 5206901 Issued on April 27, 1993. Estimated Expiration Date: 
December 23, 2011. 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.
December 23, 2011. 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 ReferencesAutomatic telephone line sharing and lockout apparatus Exclusionary device for coupling plural telephonic devices to a single central office trunk High capacity information forwarding system Automated call handling apparatus Patent #: 5023868 InventorsAssigneeApplicationNo. 812787 filed on 12/23/1991US Classes:379/211.04, Simultaneous ringing379/207.07, Transition from on-hook to off-hook (e.g., idle to busy)379/207.08, No answer (e.g., ringing signal, on-hook, idle)379/219, PLURAL EXCHANGE NETWORK OR INTERCONNECTION379/221.09, Service control point (SCP, ISCP, external database)379/221.12Service switching point (SSP)ExaminersPrimary: Dwyer, James L.Assistant: Hong, Harry S. Attorney, Agent or FirmForeign Patent References
International ClassesH04M 003/42H04M 007/00 AbstractA system for alerting a plurality of telephones in response to an incoming call to a destination directory number. A handling switch sends a query to a centralized database requesting routing instructions, and the database returns the directory numbers of the plurality of telephones to be alerted for incoming calls to the destination directory number. The busy/idle status of all of the plurality of telephones is checked, and an alerting signal is sent to all idle telephones. The handling switch is notified as to which alerted telephone has an off-hook appearance first, and the incoming call is routed to that telephone.Other References
Field of SearchMULTI-LINE OR KEY SUBSTATION SYSTEM WITH SELECTIVE SWITCHING AND CENTRAL SWITCHING OFFICE CONNECTIONWith special service Conferencing With exclusion or priority feature (e.g., lockout or privacy) Direct inward dialing Lockout Call alerting (e.g., ringing) In automatic system PLURAL EXCHANGE NETWORK OR INTERCONNECTION | |
