Coded phone security system

Details Coded phone security system Coded phone security system

1990-04-11

1992-06-30

Dwyer, James L.

Telephonic communications

Call or terminal access alarm or control

At substation

379188, 379375, H04M 166

Patent

active

051270498

ABSTRACT:
A telephone security device is placed in the telephone line between the primary transmission network and receiver. Incoming telephone calls are automatically answered and monitored for a predetermined time. When a proper code is supplied by the calling party during the monitored time interval, an audio alert is sounded so the called party may pick up the phone and responsd in a normal manner. If the phone is not picked up during the time interval, the call is terminated.

REFERENCES:
patent: 4117272 (1978-09-01), Ando
patent: 4277649 (1981-07-01), Sheinbein
patent: 4369339 (1983-01-01), Castro et al.
patent: 4430728 (1984-07-01), Beitel et al.
patent: 4520233 (1985-05-01), Smith
patent: 4611098 (1986-09-01), Giorgio et al.
patent: 4626623 (1986-12-01), LaHaye
patent: 4679226 (1985-06-01), Muehleisen
patent: 4707804 (1987-11-01), Leal
patent: 4845743 (1989-07-01), Lutz
patent: 4850013 (1989-07-01), Rose

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