Called party fraud prevention in an automated coin system

Details Called party fraud prevention in an automated coin system Called party fraud prevention in an automated coin system

1976-06-21

1977-06-21

Claffy, Kathleen H.

179 18DA, H04M 1518

Patent

active

040313255

ABSTRACT:
This invention pertains to systems servicing coin operated telephones and, more specifically, to apparatus in such systems for preventing called party fraud in simulating coin deposit signals. During intermediate coin deposit periods, the network connection between the calling and called stations is split into calling and called portions and then these portions are extended and reconnected. A filter is inserted in the extended called station portion to attenuate fraudulent coin deposit signals originating from the called station. A coin tone detector connected to the extended calling station portion is still actuated by valid coin deposit signals from the calling station, but does not detect the attenuated fraudulent signals.

REFERENCES:
patent: 2676209 (1954-04-01), Joel, Jr.
patent: 2761900 (1956-09-01), Joel, Jr.
patent: 3069502 (1962-12-01), Edstrom et al.
patent: 3428751 (1969-02-01), Edington
patent: 3453389 (1969-07-01), Shaer
patent: 3484560 (1969-12-01), Jaeger, Jr. et al.
patent: 3952160 (1976-04-01), Pasternack et al.
patent: 4001513 (1977-01-01), Naylor

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