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Call interceptor for emergency systems

  • US 5,161,180 A
  • Filed: 10/19/1990
  • Issued: 11/03/1992
  • Est. Priority Date: 10/19/1990
  • Status: Expired due to Fees
First Claim
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1. A device, having a data base of information stored in an internal memory, for use as an adjunct to an existing telephone switching and control system and for responsively providing, to 911 and enhanced 911 emergency systems, selected extension identifying information which includes at least the number and location of an extension telephone of said telephone system from which a call comprised of the three digits 911 originates, said device comprising:

  • sensing means for sensing an off-hook condition of any of a plurality of extension telephones of said telephone system;

    detecting means for detecting dialing signals from said extension telephones of said telephone system, whether or not said extension telephones are in said off-hook condition;

    selectable responding means for responding to the pressing of a selected single key of said extension telephones as a designated "Panic Button", alternate means of generating a 911 emergency call, said alternate call generating means being functional without the need for taking said extension telephone off-hook;

    identification means for determining whether or to said dialing signals from said extension telephones comprise an emergency 911 call, and whether or not said dialing signals were generated by said selected key of said extension telephones as an alternate, "Panic Button" method for dialing said emergency call;

    dial tone processing means for detecting, generating, and suppressing at least one dial tone;

    memory access means for selectively retrieving and transmitting selected items from said data base of information in response to a finding by said identification means that said call is a 911 emergency call, and appropriate externally generated interrogation signals;

    telephone system conformation means for causing said device to modify selected functions thereof in order to conform to selected functions of said telephone system at which said device is installed, aid selected functions of said telephone system including a need for dialing an access code consisting of at least one digit to access an outside line of said phone system in order to dial 911 and the inability of said telephone system to reroute said 911 calls;

    interface means for interfacing with computers, conventional telephones, telephone lines and circuits; and

    automatic rerouting means for automatically dialing alternate destination telephone numbers and automatically selecting alternate telephone lines over which to transmit information in case of apparent failure of initially selected route.

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