Interface for a data telephone and data terminal in a...

Interface for conducting serial digital data communications...

Interface system isolating a subscriber subset from a...

Interfacing a smart card with a telecommunications network...

Interfacing fiber optic data with electrical power systems

Interference canceling method and apparatus

Interference insensitive line supervision circuit

Interlock circuit for preventing corruption of telephone...

Intermediate voice and dtmf detector device for improved...

Intermittent drive mechanism

Internal line control system

International authorization system

International origination to domestic termination call blocking

International priority calling system

International telephone routing...

Internet access system using voiceband modems and...

Internet and telephony based messaging system

Internet based telephone line

Internet call waiting

Internet call waiting with voice mail system that provides...