LandOfFree - US Patents - Listing for Telephonic communications,Supervisory or control line signaling

Telephonic communications – Supervisory or control line signaling – Substation originated

Fast redial system for a telephone

Telephonic communications – Supervisory or control line signaling – Substation originated

First dialed digit detector and comparator

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

Flexible ring-tone service

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

Flickering device for telephone sets

Telephonic communications – Supervisory or control line signaling – Signal receiver

Frequency error detection methods and systems using the same

Telephonic communications – Supervisory or control line signaling – Signal receiver

Frequency selective ringer circuit

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

Generation of consistent haptic effects

Telephonic communications – Supervisory or control line signaling

Global directory service with intelligent dialing

Telephonic communications – Supervisory or control line signaling

Global directory service with intelligent dialing

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection

Ground start and tip ground detection without the use of -48V or

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection

Half-duplex controller

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection

Half-duplex speakerphone

Telephonic communications – Supervisory or control line signaling – Substation originated

Handheld electronic device having improved phone call log,...

Telephonic communications – Supervisory or control line signaling – Substation originated

Hands free phone set with hand held remote control for controlli

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection

Hands-free speaking device with echo canceler

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection

Hands-free telephone apparatus

Telephonic communications – Supervisory or control line signaling – Signal receiver

High density signal classifier for media gateways

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection

High impedance polarity detector

Telephonic communications – Supervisory or control line signaling – Signal receiver

High performance multifrequency signal detection