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Virtual wide area centrex

  • US 5,892,821 A
  • Filed: 12/13/1996
  • Issued: 04/06/1999
  • Est. Priority Date: 06/02/1995
  • Status: Expired due to Term
First Claim
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1. A method of configuring a telephone network for providing Wide Area Centrex services to a number of customer sites having a plurality of telephone network devices, said telephone network having a number of telephone switching offices equipped with SSPs (Service Switching Points) operating with AIN (Advanced Intelligent Network) application software for providing Centrex functionality to said telephone network devices at said customer sites, comprising the steps of:

  • a) assigning, as a switch resident datafill, a network node address (NNA) to each telephone network device used at said customer sites requiring Centrex functionality;

    b) assigning a customer network address (CNA) to each of said telephone network devices, each assigned CNA having a corresponding NNA;

    c) assigning, as a switch resident datafill, a Business Group ID (BGID) to each of said telephone network devices to enable a Centrex subscriber using said telephone network device to reach another telephone network device in one of said customer sites using abbreviated dialing of said CNA; and

    d) providing, to each of said SSPs, access to a number translation database table to provide when requested by said SSPs a translation of a CNA to a corresponding NNA and of a NNA to a corresponding CNA when Centrex and Public Switched Telephone Network (PSTN) calls are received and initiated from and to one of said telephone network devices.

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