Telephone line access control apparatus

Details Telephone line access control apparatus Telephone line access control apparatus

1997-01-28

1998-10-06

Chiang, Jack

Telephonic communications

Terminal accessory or auxiliary equipment

Locking device

379200, 379194, H04M 100, H04M 300, H04M 166

Patent

active

058189319

ABSTRACT:
A telephone line access control apparatus to restrict access to an outgoing telephone line may be placed in a locked mode to restrict access to the telephone line, or in an unlocked mode to enable full and unrestricted access to the controlled telephone line. The apparatus supports the answering of all incoming calls, and when in the locked mode restricts access to the telephone line by enabling a person to dial only preselected emergency telephone numbers. The invention is configured with a filter, which may be coupled to the telephone line, as required, to restrict the dialing and placing of unauthorized telephone numbers. Another embodiment of the invention is arranged with a plug that may be plugged into a telephone jack in a secured manner so that the apparatus may only be unlocked and removed from the telephone jack by individuals having a key.

REFERENCES:
patent: 2219444 (1940-06-01), Fewings et al.
patent: 4683583 (1987-07-01), Kossor
patent: 4975943 (1990-12-01), Weber et al.
patent: 5559874 (1996-09-01), Panosh

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