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Arrangement for serving a telephone office code from two switching systems

  • US 5,237,604 A
  • Filed: 06/28/1991
  • Issued: 08/17/1993
  • Est. Priority Date: 06/28/1991
  • Status: Expired due to Term
First Claim
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1. A method of establishing a telephone call from a caller to a customer, said customer'"'"'s plain old telephone service (POTS) number comprising an office code assigned to a first switch but served by a second switch, comprising the steps of:

  • receiving in a third switch of a public switched network, said POTS number assigned to said first switch;

    in said third switch, translating the office code of said POTS number to determine whether POTS numbers of said office code are served from two other switches;

    if said translating step indicates that said office code is served from two other switches, transmitting a query message, comprising said POTS number, from said third switch of said public switched network to a database shared by a plurality of switches;

    responsive to receiving said query, translating in said database to determine information for use in routing said call to said second switch, and transmitting a message comprising said information to said third switch; and

    responsive to receiving said information, using said information for routing said call from said third switch to said second switch.

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