Group emergency call system

Details Group emergency call system Group emergency call system

1989-10-26

1992-11-24

Dwyer, James L.

Telephonic communications

Emergency or alarm communications

Central station with plural substations

379 37, 379 45, H04M 1104

Patent

active

051669722

ABSTRACT:
A group emergency call system for use in a central office exchange or other communication system for alerting a group of people in the event of an emergency. Data in the form of a hunt group assignment table is stored within the communication system, containing a predetermined pilot number for defining a particular emergency hunt group within the communication system, and a plurality of directory numbers corresponding to respective ones of the subscriber sets assigned to the emergency hunt group. Circuitry is provided for receiving dialed digit signals designating an incoming emergency call from a predetermined one of the subscriber sets and comparing the dialed digits with the pilot number, and in the event the dialed digit signals correspond to the predetermined pilot number generating a request device message signal. Circuitry is provided for receiving the request device message signal and in response retrieving the directory numbers from the emergency hunt group assignment table and generating a plurality of ringing signals for simultaneously ringing respective ones of the subscriber sets assigned to the emergency hunt group, such that members of the emergency hunt group are alerted to the incoming emergency call.

REFERENCES:
patent: 3865985 (1975-02-01), Stankus
patent: 4259549 (1981-03-01), Stehman
patent: 4466095 (1984-08-01), Kawano et al.
patent: 4694487 (1987-09-01), Chang et al.
patent: 4747130 (1988-05-01), Ho

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