Telephone polling apparatus using a plurality of timers to detec

Details Telephone polling apparatus using a plurality of timers to detec Telephone polling apparatus using a plurality of timers to detec

1978-07-03

1980-05-06

Cardillo, Jr., Raymond F.

179 6D, H04M 346

Patent

active

042018960

ABSTRACT:
A telephone polling apparatus uses an energy detection device in cooperation with timing elements to provide discrimination between various conditions on the telephone line. These conditions are (1) a busy condition, (2) an answer condition, which can occur with someone speaking, not speaking, or with a recorded announcement, and (3) a no answer condition.

REFERENCES:
patent: 3728486 (1973-04-01), Kraus
patent: 3733440 (1973-05-01), Sipes
patent: 3925622 (1975-12-01), Robinson
patent: 3943289 (1976-03-01), Sheldon et al.
patent: 3999017 (1976-12-01), Thorne
patent: 4065642 (1977-12-01), McClure

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