Telephone automatic redial system

Details Telephone automatic redial system Telephone automatic redial system

1988-05-19

1989-12-12

Ng, Jin F.

Telephonic communications

Supervisory or control line signaling

Substation originated

379359, 379216, H04M 126

Patent

active

048872946

ABSTRACT:
An automatic redialing system for a telephone utilizing a conventional call progress decoder and a conventional redial memory. The system utilizes logic circuitry with gates that can be economically fabricated as CMOS transistor integrated circuits. The circuitry has two circuits. One circuit, called a redial initiation circuit, is responsive to a dial tone signal from the call progress decoder to signal the redial memory to redial the number stored therein. The other circuit, called a redial interrupt circuit, is responsive to a busy tone signal from the call progress decoder for signaling an interruption to the redial sequence. The latter circuit includes a timer for temporarily interrupting the dialing sequence for predetermined periods of time and a counter for interrupting the redialing sequence after a number has been redialed a predetermined number of times.

REFERENCES:
patent: 3665113 (1972-05-01), Blake et al.
patent: 3792203 (1974-02-01), Martin
patent: 4143243 (1979-03-01), Sutton
patent: 4209668 (1980-06-01), Weinberger et al.
patent: 4737984 (1988-04-01), Brown

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