Method of providing virtual private network telephone service
Patent 4348554 Issued on September 7, 1982. Estimated Expiration Date: 
March 21, 2000. 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.
March 21, 2000. 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 References 3150236 3157743 3188396 3309467 3749845 3760105 InventorAssigneeApplicationNo. 06/132534 filed on 03/21/1980US Classes:379/112.09, Specialized exchange379/111, WITH USAGE MEASUREMENT (E.G., CALL OR TRAFFIC REGISTER)379/221.01, Alternate routing379/901, VIRTUAL NETWORKS OR VIRTUAL PRIVATE NETWORKS379/903PASSWORDExaminersPrimary: Brown, Thomas W.Attorney, Agent or FirmInternational ClassH04Q 3/00 (20060101)AbstractA method is disclosed for providing private network types of telephone services via the public switched network without having it provide private hardware facilities. The method is described with respect to a telephone system comprising plural telephone stations and offices, a data base, and a data communications network connecting some of the offices to the data base. Information is stored at the data base defining a virtual private network. The information includes a description of the bounds of the virtual network and its capacity in terms of virtual telephone facility resources of a prescribed type. In response to a call directed to the virtual network, a verification is made at the data base that this call is entitled to complete via the virtual network and that an idle virtual resource is available for assignment to the call. The idle resource is assigned to the call, and the call is completed via the public switched network.Other References
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