LandOfFree - US Patents - Listing for Telephonic communications

Telephonic communications – Plural exchange network or interconnection – Interexchange signalling

VoIP call routing

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Testing of subscriber loop or terminal

VoIP call through tester

Telephonic communications – Audio message storage – retrieval – or synthesis – Voice activation or recognition

VoIP caller authentication by voice signature continuity

Telephonic communications – Subscriber line or transmission line interface – Power supply

Voltage alternating switch circuit

Telephonic communications – Subscriber line or transmission line interface – Protective circuit

Voltage and protection arrangement for a telephone...

Telephonic communications – Subscriber line or transmission line interface – Power supply

Voltage reference filter for subscriber line interface circuit

Telephonic communications – Subscriber line or transmission line interface – Network interface device

Voltage regulator control circuit for a subscriber line interfac

Telephonic communications – Multi-line or key substation system with selective switching... – Line status indication or call alerting

Voltage-sensitive telephone line monitor

Telephonic communications – Terminal – Housing or housing component

Volume attenuator for flip-style hand-held phone

Telephonic communications – Supervisory or control line signaling – Signal reception at substation

Volume control apparatus of telephone

Telephonic communications – Having light wave or ultrasonic link for speech or paging... – Including fiber optic link within telephone network

Volume control for a dual mode communications device

Telephonic communications – Special services – Conferencing

Volume control in digital teleconferencing

Telephonic communications – Supervisory or control line signaling

Volume controller

Telephonic communications – Audio message storage – retrieval – or synthesis

VOX remote unit control in a cellular system