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

Telephonic communications – Supervisory or control line signaling – Substation originated

Successive key operating mechanism for telephone dialing

Telephonic communications – Supervisory or control line signaling

Supervisory control system

Telephonic communications – Supervisory or control line signaling – Substation originated

Support structure for a keypad

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

Surge protected electronic switch for telephone voiceband circui

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

Switch hook status determination in a communication system

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

Switched network call progress protocol analyzer

Telephonic communications – Supervisory or control line signaling – Substation originated

System and method for automatically creating new pages in a touc

Telephonic communications – Supervisory or control line signaling – Substation originated

System and method for connecting pending and preset...

Telephonic communications – Supervisory or control line signaling – Substation originated

System and method for controlling the dialing order of call reco

Telephonic communications – Supervisory or control line signaling – Substation originated

System and method for creating a personal directory

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

System and method for customising call alerts

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

System and method for deriving sealing current

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

System and method for detecting an off-hook condition

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

System and method for detecting customer premises equipment aler

Telephonic communications – Supervisory or control line signaling – Substation originated

System and method for displaying numbers on a telephone with no

Telephonic communications – Supervisory or control line signaling – Signal receiver

System and method for DTMF detection using likelihood ratios

Telephonic communications – Supervisory or control line signaling – Signal receiver

System and method for dual tone multifrequency detection using v

Telephonic communications – Supervisory or control line signaling – Substation originated

System and method for early detection of area code changes

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

System and method for eliminating bell tap on analog telephones