Telephone security violation detection device

Details Telephone security violation detection device Telephone security violation detection device

1985-12-16

1987-07-14

Dwyer, James L.

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

With blocking of normal usage

379 7, 379387, H04M 124

Patent

active

046807837

ABSTRACT:
A method and system for detection of authorized connections to a telephone line where such connections are for the purposes of intercepting voice or data messages. The original or base line impedance would be measured by the system in response to the entry of a special code. The base line is stored in memory and used for subsequent impedance comparisons.

REFERENCES:
patent: 4186282 (1980-01-01), Ellson
patent: 4197435 (1980-04-01), Jackson et al.
patent: 4218592 (1980-08-01), Steinbergs et al.
patent: 4413163 (1983-11-01), Basini
patent: 4634813 (1987-01-01), Hensley

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