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

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

Facsimile apparatus for outputting a melody when receiving a...

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

Facsimile apparatus for outputting a melody when receiving a...

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

Fallback function telecommunications device

Telephonic communications – Supervisory or control line signaling – Signal receiver

False tone detect suppression using multiple frame sweeping...

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

Far-end disconnect detector for telephony systems

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