TELEPHONE AUTOMATIC REDIAL SYSTEM

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.