Phone screen security system

Details Phone screen security system Phone screen security system

1988-08-10

1989-08-22

Dwyer, James L.

Telephonic communications

Call or terminal access alarm or control

At substation

379200, 379188, H04M 166

Patent

active

048603473

ABSTRACT:
A phone screen security system for blocking unwanted incoming phone calls and unauthorized outgoing phone calls includes a ringer pick up circuit which is actuated by a conventional ring signal of an incoming call on an outside phone line. The ringer pick up circuit actuates a voice synthesizer which requests a caller to input a security code. The input tone signal is transmitted to a code detect circuit which compares the input signal with a preprogammed security code. A timing circuit is connected to the code detect circuit and the ringer pick up circuit for disconnecting the outside phone line after a predetermined time interval if a correct security code is not detected. If a caller inputs the correct security code, the voice synthesizer is actuated to inform the caller. If an incorrect security code is input, the caller is disconnected. The code detect circuit connects the incoming call to a lines select relay if the correct security code is entered. The line select relay routes the call to the correct inside phone line and includes a ringer circuit for sending a ring signal to the appropriate inside phone line.

REFERENCES:
patent: 4446334 (1984-05-01), Groff
patent: 4520233 (1985-05-01), Smith
patent: 4578540 (1986-03-01), Borg et al.
patent: 4621334 (1986-11-01), Garcia
patent: 4634811 (1987-01-01), Curtin et al.
patent: 4674115 (1987-06-01), Kaleita et al.
patent: 4680785 (1987-07-01), Akiyama et al.

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