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Integrated circuit configurations and methods for providing functions for public telephones
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Service tool and method for public telephone
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Tamper resistant coin acceptance and collection apparatus and method
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Billing system
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Billing system
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Intelligent public telephone system and method
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Billing system
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Automated audio teleconferencing having reconfiguration feat ures
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Apparatus and method for automated audio teleconferencing having enhanced access and security features
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Apparatus and method for automated audio teleconferencing having enhanced billing and reservation features
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Coin discrimination method
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Coin return cover
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Coin discrimination method
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Coin validation method and apparatus for a coin telephone or similar system having an escrow mechanism
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Telephone system and method operated from central office loop current
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Telephone system and method operated from central office loop current
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Toll telephone system and method for maintaining or initiating loop current after resuming on-hook condition
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Intelligent toll telephone system and method
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