Administrative monitoring system for calling card fraud preventi
Apparatus for facilitating the making of a calling card telephon
Apparatus for optically coupling a terminal unit to the public t
Apparatus for querying a central service
Applications platform for a telephone system gateway interface
ATM phone card system
ATM phone card system
Call blocking based on call properties
Call setup for prepaid services
Card pay telephone with speed dialing
Card-operated telephone
Combination pre-paid and calling card
Combination pre-paid and calling card
Communication apparatus utilizing digital optical signals
Computer-to-telephone interface
Credit card collect call system and method
Credit card telephone station
Credit transaction arrangements
Credit/calling card pay telephone method and system employing te
Debit calling label