Disaster alert by telephone system

Details Disaster alert by telephone system Disaster alert by telephone system

1999-01-27

1999-12-14

Chan, Wing F.

Telephonic communications

Emergency or alarm communications

Announcement or alarm received at terminal station

379 49, 340601, H04M 1104

Patent

active

060027487

ABSTRACT:
Local telephone exchanges in a threatened geographical area connect to their subscribers and transmit a recorded warning message. This is done in response to transmission of threat data communicated from one of several remote computer terminals to a central computer. The central computer has a data storage device upon which is stored a local exchange database and preferably recorded warning messages. Upon receipt of the threat data from the remote computer terminal, the central computer is connected in communication with the local exchanges in the threatened geographical area and instructs the local exchanges to connect to its subscribers and provides instructions or a warning message to be played to the subscribers who go off-hook.

REFERENCES:
patent: 3603951 (1971-09-01), O'Bracken
patent: 3643029 (1972-02-01), Breazeale
patent: 3665462 (1972-05-01), Seaton et al.
patent: 4155042 (1979-05-01), Permut et al.
patent: 5218708 (1993-06-01), Kanbayashi et al.
patent: 5794207 (1998-08-01), Walker et al.
patent: 5917887 (1999-06-01), Fesler et al.
patent: 5949851 (1999-09-01), Mahaffey

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