Telecommunication station with call blocking and call transferri

Telecommunications fraud detection scheme

Telecommunications functions management system for managing outg

Telemarketer screening

Telephone accessory incorporating demand meter for multiple user

Telephone answering system with call screening circuit

Telephone apparatus with recording of phone conversations on mas

Telephone bar device

Telephone call duration control

Telephone call forwarding device

Telephone call screening apparatus

Telephone call screening apparatus

Telephone call screening circuit

Telephone dialing system for specialized services

Telephone for inhibiting specific calls dialed by an audible ton

Telephone fraud detection and prevention

Telephone fraud detection system

Telephone intercept apparatus and method for intercepting an...

Telephone line access control

Telephone line security system