Telephone pay station providing limited coin-free calls

Details Telephone pay station providing limited coin-free calls Telephone pay station providing limited coin-free calls

H - Electricity

04

M

344/22, 379/74,

H04M 17/00 (2006.01) H04M 17/02 (2006.01)

Patent

CA 1052922

ABSTRACT A circuit for providing coin-free dialing of a predetermined number of digits is provided for use with a telephone pay station. A signal generator to provide a pulse in response to each telephone number dialed is included. The signal after counting a predetermined number of pulses. A phantom coin circuit is connected to the counter and to the telephone central office for simulating the existence of a coin to the central office to cause the central office to accept the dialing signals. Another circuit is provided for prevention of fraudulent push- button chain-dailing. This fraud prevention circuit includes a timing circuit and a latch which effectively shunts the push- button dial if chain-dialing is attempted.

251928

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