Telephone line security system

Details Telephone line security system Telephone line security system

1989-05-26

1990-10-23

Brown, Thomas W.

Telephonic communications

Call or terminal access alarm or control

Fraud or improper use mitigating or indication

379200, 379445, H04M 119, H04M 166

Patent

active

049654594

ABSTRACT:
A telephone line security system which provides for telephone subscriber designation of secure digit sequences, exception digit sequences, and authorization digit sequences, wherein the user must necessarily assert a subscriber designated authorization digit sequence onto the telephone line in order to place a telephone call to a telephone number containing a secure digit sequence, unless the subscriber has designated an exception digit sequence to the secure digit sequence. The telephone line system is contained within a secure housing and comprises a telephone line interface circuit, a dial tone detection circuit, a digit determination circuit, a secure digit sequence programming circuit, an authorization digit sequence programming circuit, an exception digit sequence programming circuit, a sequence determination circuit, a system reset circuit, a secure digit sequence detection circuit, an authorization digit sequence detection circuit, an exception digit sequence detection circuit, a telephone call authorization circuit, and a power supply circuit. Designation of all digit sequences is by subscriber programmable circuit and maximum control of what telephone calls may be made, and by what user, on the subscriber's telephone line is maintained.

REFERENCES:
patent: 3920936 (1975-11-01), Mogtader
patent: 4008379 (1977-02-01), Watkins
patent: 4096357 (1978-06-01), Mogtader
patent: 4099033 (1978-07-01), Murray
patent: 4246445 (1981-01-01), Hayasaka et al.
patent: 4251692 (1981-02-01), Waldman
patent: 4297534 (1981-10-01), Epstein et al.
patent: 4358640 (1982-11-01), Murray
patent: 4482787 (1984-11-01), Sagara et al.
patent: 4511765 (1985-04-01), Kuo

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