Toll telephone system and method for maintaining or...

Details Toll telephone system and method for maintaining or... Toll telephone system and method for maintaining or...

H - Electricity

04

M

379/74

H04M 17/00 (2006.01) H04M 1/06 (2006.01) H04M 17/02 (2006.01)

Patent

CA 1272530

TOLL TELEPHONE SYSTEM AND METHOD FOR MAINTAINING OR INITIATING LOOP CURRENT AFTER RESUMING ON-HOOK CONDITION ABSTRACT OF THE DISCLOSURE 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.

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