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Methods and apparatus for transmitting accurate emergency location identification numbers (ELINs) from behind a multi-line telephone system (MLTS) utilizing port equipment numbers

  • US 6,757,359 B2
  • Filed: 03/23/2001
  • Issued: 06/29/2004
  • Est. Priority Date: 03/23/2001
  • Status: Expired due to Term
First Claim
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1. A method for processing an emergency call made from behind a PBX/MLTS, said method comprising the steps of:

  • a) assigning a port equipment number (PEN) to each device/trunk of the PBX/MLTS;

    associating attributes with a particular PEN, said attributes comprising at least one of a call back number, an emergency location identification number (ELIN), an ELIN type, device identification information or other optional entries;

    c) maintaining a centralized database of elements corresponding to each PEN, each element identifying one of said attributes;

    d) detecting emergency calls;

    e) determining the PEN from which the emergency call originated; and

    f) transmitting to a public safety answering point (PSAP) one or more elements of said database entry of said PEN.

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