Regional centrex

  • US 5,920,619 A
  • Filed: 06/20/1997
  • Issued: 07/06/1999
  • Est. Priority Date: 10/05/1994
  • Status: Expired due to Term
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First Claim
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1. A telephone network system offering centrex services, the telephone network system comprising:

  • a plurality of a telephone exchanges, a least one closed user group formed from subscribers connected to the exchanges so that one closed user group may be distributed as a subgroup to several different telephone exchanges, wherein a subscriber, within the closed user group, can call to a member of the same user group using a subnumber independent of an actual directory number, and the subscriber can make an external call from the closed user group by first dialing an out-line number; and

    a subscriber database, the subscriber database being stored in each exchange with subscribers of the closed user group, the subscriber database being associated with this user group and containing all necessary data for implementing centrex services, whereby the call control of the exchange, having detected, based on the subscriber data that the subscriber belongs to the closed user group, utilizes the subscriber database when establishing a call, the subscriber database being a table.

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