Emergency telephone communications system

Details Emergency telephone communications system Emergency telephone communications system

1996-05-21

1998-12-01

Loomis, Paul

Telephonic communications

With usage measurement

Call traffic recording or monitoring

379113, 379 45, 379 48, 379207, 379 69, H04M 1500, H04M 1104, H04M 342, H04M 164

Patent

active

058449744

ABSTRACT:
An emergency telephone communications system allows communications during congestion in the event of disaster. The system includes an exchange and telephones connected to the line circuits thereof. The exchange sends a congestion generation signal to a control section to initiate emergency processing when a congestion detecting circuit detects more than a predetermined number of the line circuits in the off-hook state. The control section has a congestion management table listing subscribers and stores not-yet-serviced subscribers when congestion has occurred. The not-yet-serviced subscribers are successively selected from the congestion management table, and calling signals are sent to their telephones. When the subscribers go off-hook within a predetermined time, the control section controls the emergency dial pulse receiver circuit to be ready for reception, and then controls the switch to connect an emergency service trunk to the line circuits to send a tone signal or a voice message. Upon receipt of telephone numbers of the receiving parties sent from the subscribers, the exchanges at the receiving parties are called through the emergency trunk circuit. The telephones send telephone numbers of the receiving parties at a predetermined time after detection of incoming calls from the exchange, or after detection of a given signal.

REFERENCES:
patent: 4839892 (1989-06-01), Sasaki
patent: 5249223 (1993-09-01), Vanacore
patent: 5596625 (1997-01-01), Leblanc
patent: 5692033 (1997-11-01), Farris

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