Conditional autodialer

Details Conditional autodialer Conditional autodialer

1997-10-31

2000-12-26

Chan, Wing F.

Telephonic communications

Supervisory or control line signaling

Substation originated

379 38, 379216, H04M 1272

Patent

active

061671304

ABSTRACT:
A conditional autodialer coupled to a telephone line is adapted to selectively automatically dial a predetermined telephone number, after a predetermined delay period following the appearance of an on-hook to off-hook transition on the telephone line. The autodialer includes an off-hook detector, a touch tone detector, a memory for storing the predetermined number, a dialer and a controller (such as a microprocessor) coupled to receive signals from the off-hook detector and touch tone detector, to communicate with the memory and to provide command signals to the dialer. In operation, the controller responds to an off-hook condition by starting the delay period. If the delay period successfully times out, the controller reads the predetermined number from memory and enables the dialer to dial the number onto the telephone line. However, if, during the delay period, the presence of a DTMF digit or an incoming call is sensed, dialing the predetermined number onto the line is prevented. Preferably, both the predetermined number and the length of the predetermined delay period are programmable from the telephone set. The conditional autodialer may be embodied in a stand-alone unit or integrated with an individual telephone set.

REFERENCES:
patent: 4802208 (1989-01-01), Yeh
patent: 5465297 (1995-11-01), Azem
patent: 5475751 (1995-12-01), McMonagle, Jr. et al.
patent: 5493604 (1996-02-01), Hirayama
patent: 5673304 (1997-09-01), Connor et al.
patent: 5768363 (1998-06-01), Dautartas et al.
Eubank, C. H., "Programmed one-number telephones place calls automatically", Bell Laboratories Record, May 1971, USA, vol. 49, No. 5, pp. 135-138.

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