Answer detection method and apparatus for coin telephone sets

Anti-explosive return coin discharge unit for the cabinet of a c

Anti-fraud device for use with a coin operated telephone instrum

Anti-stuffing coin return assembly

Anti-stuffing lead-in-chute on coin acceptor for payphone

Apparatus and method for securing an armored cord and restraint

Coin fraud preventing unit and modular configurations for pay te

Coin fraud preventing unit and modular configurations for pay te

Coin fraud prevention system for coin telephones

Coin fraud prevention unit and modular configurations for pay te

Coin return anti-stuffing apparatus and method

Coin return mechanism protecter

Coin telephone box with anti-stuffing coin return chute

Coin telephone data port protection

Coin tone validator for telephone paystations

Country to domestic call intercept process (CIP)

Detection of telephone number spoofing

Dial assembly terminalgard

Domestic origination to international termination country...

Encryption of telephone calling card codes