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Telecommunications

Telephone-call-restricting-apparatus

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Telephone call restricting apparatus

Details

Inventors: Waldman, Herbert H.;
Assignee:
Primary Examiner: Brown; Thomas W.
Assistant Examiner:
Attorney, Agent or Firm: Friedman, Goodman & Teitelbaum

An apparatus for restricting telephone calls placed onto a telephone line by a telephone set, wherein an off-hook condition begins operation of the apparatus and energizes a control circuit which provides a condition in which a call can be placed onto the telephone line. A disabling circuit responds to the control circuit and establishes a disabling condition on the telephone line which defeats a telephone call when it is of a restricted type. In one embodiment, the off-hook condition starts a time delay at the end of which a predetermined frequency is placed onto the line. The occurrence of this frequency signal onto the telephone line disconnects all long distance telephone calls beyond a specified local zone. In a second embodiment, each number entered onto the telephone line is counted, and when a predetermined count is reached the disabling circuit is operated to prevent further calling. In a third embodiment, the telephone remains disabled after being placed in an off-hook condition, and all calling is prevented. However, at predetermined intervals, the telephone is enabled so that during each interval a respective number can be called. The apparatus can include an override circuit for use by special preselected individuals for overriding the disabling condition, thereby permitting such special individuals to avoid the restrictions of the telephone calls.

DETAILED DESCRIPTION It is accordingly an object of the present invention to provide an apparatus for restricting the type of calls placed by a telephone set onto the telephone line.
A further object of the present invention is to provide a telephone restricting apparatus which can restrict the use of a telephone to local calls and prevent long distance calls.
Another object of the present invention is to provide a restricting apparatus for a telephone set which can be utilized for both rotary dialing and Touch-Tone telephone systems.
Yet a further object of the present invention is to provide a telephone restricting apparatus which restricts the type of calls placed on a telephone set, and is connected in parallel across the telephone line.
Another object of the present invention is to provide a telephone call restricting apparatus which can be selectively utilized to restrict certain type of calls, such as long distance calls, central switching calls, or all outgoing calls.
Another object of the present invention is to provide a telephone call restricting apparatus which is capable of distinguishing and can restrict operator assisted outgoing calls of a restricted nature beyond a specified zone while permitting operator assisted calls of other natures such as emergencies or local calls.
Still another object of the present invention is to provide a telephone call restricting apparatus which generally restricts specified types of calls, but which can be disengaged by specially selected personnel.
A further object of the present invention is to provide a telephone restricting apparatus which detects the type of call placed on the telephone line, and when it is of a restricted type, establishes a disabling condition on the telephone line which inhibits further progress of the telephone call.
Yet a further object of the present invention is to provide an apparatus for restricting certain types of telephone calls which will operate to inhibit the progress of a restricted outgoing call without preventing the operation of receiving incoming calls

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