Telephone circuit to control off-hook status during receipt of c

Telephone communication apparatus

Telephone communication apparatus and method having automatic se

Telephone connection arrangement for a personal computer and a d

Telephone connection system, telephone connecting method,...

Telephone customer support utility

Telephone device capable of preventing unauthorized...

Telephone display

Telephone DTMF signal accessible data processor with calculator

Telephone handset interface for alternating voice-data (AVD) mod

Telephone handset interface for automatic switching between voic

Telephone handset interface for automatic switching between voic

Telephone handset with full-page visual display

Telephone having convenience feature data transfer capability

Telephone interface call processing system with call selectivity

Telephone interface call processing system with call selectivity

Telephone interface call processing system with call...

Telephone interface for a computer for receiving and transmittin

Telephone interface protection circuit and modem using same

Telephone line exclusion device