Toll telephone system and method for maintaining or initiating l

Details Toll telephone system and method for maintaining or initiating l Toll telephone system and method for maintaining or initiating l

1986-12-22

1988-07-19

Schreyer, Stafford D.

Telephonic communications

With check operated control

Fraud or interference prevention

379123, H04M 1700, H04M 106

Patent

active

047590548

ABSTRACT:
A toll telephone connected to a coin trunk including tip and ring conductors in which loop current flows from the central office and through the telephone responsive to an off-hook condition at the telephone includes electronic circuitry for maintaining the loop current flow through the telephone for a predetermined period of time after the hook switch is opened, in order to accomplish certain telephone functions. Those functions include operation of an escrow relay, prevention of hook switch fraud, prevention of central office call termination until the call is legitimately completed and completion of certain call accounting functions.

REFERENCES:
patent: 4595983 (1986-06-01), Gehalo et al.
patent: 4625078 (1986-11-01), Grouch et al.

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