Communication terminal having functions of detecting and prevent

Details Communication terminal having functions of detecting and prevent Communication terminal having functions of detecting and prevent

1994-04-05

1995-07-25

Chin, Stephen

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

For detection of eavesdropping device

379 35, 379164, H04M 124

Patent

active

054369592

ABSTRACT:
A communication terminal connected to a line of an exchange of a public network, includes a main body of the communication terminal, and a line branching detection controller coupled to the main body. The line branching detection controller includes a communication state detector enabling the communication terminal to call and receive a call when a communication operation of the communication terminal is detected, a line signal monitoring part activated when the communication state detector detects no communication operation and monitoring signals on the line connected to the exchange when activated, and an interference signal generator driven when the line signal monitoring part detects a signal indicating a communication made on the line and generating an interference signal on the line when driven.

REFERENCES:
patent: 4969178 (1990-11-01), Chen et al.

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