Telephone system

Details Telephone system Telephone system

1975-12-22

1977-10-04

Robinson, Thomas A.

H04M 150

Patent

active

040525708

ABSTRACT:
A telephone set which will automatically redial a telephone number after a busy signal has been received and continues redialing that number until the party being called answers, or until a predetermined number of attempts have been made. As the user dials a telephone number onto the telephone line, whether by manual dialing or by utilizing pulse-type dialing of "touch-tone" type, the number is simultaneously stored in a storing device. A signal detector detects the receiving of a busy signal in response to the dialing of the telephone number. A control circuit, responsive to both the detection of a busy signal and the releasing of the telephone line, waits a predetermined fixed amount of time subsequent to which it seizes the line and causes the number stored to be redialed onto the telephone line. If a busy signal again occurs, a line disconnect circuit responds by releasing the line. The routine is repeated for a predetermined number of times or until a normal ringing signal is obtained, and thereafter the control circuit and the storing means are reset.

REFERENCES:
patent: 3760121 (1973-09-01), Nissim
patent: 3792203 (1974-02-01), Martin
patent: 3868479 (1975-02-01), Schweitzer
patent: 3885108 (1975-05-01), Zock
patent: 3899645 (1975-08-01), Brafman
patent: 3920926 (1975-11-01), Lenaerts et al.

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