Public telephone system

Details Public telephone system Public telephone system

1994-04-26

1995-10-31

Chin, Stephen

Telephonic communications

With check operated control

Fraud or interference prevention

379189, H04M 1700, H04M 300

Patent

active

054636795

ABSTRACT:
A public telephone system includes public telephone sets assigned with different specific numbers and allowing speech communication using cards and a center apparatus connected to the public telephone sets through a telephone line. The center apparatus includes a list number forming unit for forming one list number from numbers of a plurality of invalid cards produced by illegally rewriting the cards, a registering unit for registering each formed list number in association with a series number, management number, and telephone number of each of the telephone sets, a storage unit for storing the list number and the series number, management number, and telephone number of each telephone set, all of which are registered by the registering unit, and a list number transmitting unit for calling, through the telephone line, each public telephone set corresponding to the telephone number registered in the storage unit and transmitting a list number corresponding to each telephone set. Each public telephone set includes a controller for controlling on the basis of the list number whether speech communication is allowed in use of a card.

REFERENCES:
patent: 4731818 (1988-03-01), Clark, Jr. et al.
patent: 4995942 (1990-12-01), Zebryk

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