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Class Information
Number: 379/350
Name: Telephonic communications > Supervisory or control line signaling
Description: Subject matter for transmitting either a selective control signal, or a status indicating signal, over a telephone line.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7516219 |
Consumer configurable mobile communication web filtering solution |
Apr. 7, 2009 |
| 7377952 |
System and method for removing contaminates from the air in a mail-sorting room |
May. 27, 2008 |
| 7200220 |
Portable telephone maintenance service system and maintenance service method |
Apr. 3, 2007 |
| 7142663 |
Global directory service with intelligent dialing |
Nov. 28, 2006 |
| 7106842 |
Method of detecting cut-off calls in a switching system |
Sep. 12, 2006 |
| 7046755 |
Digital access arrangement circuitry and method for connecting to phone lines having a DC holding circuit with switchable time constants |
May. 16, 2006 |
| 6975721 |
Global directory service with intelligent dialing |
Dec. 13, 2005 |
| 6968049 |
Transmission of charging signals on a data transmission path |
Nov. 22, 2005 |
| 6956942 |
Multi-modal address book |
Oct. 18, 2005 |
| 6813353 |
Redundant operation of ring voltage generators utilizing voltage bus segmentation for fault isolation |
Nov. 2, 2004 |
| 6810120 |
Method of determining answer supervision at a line appearance of a public switch telephone network |
Oct. 26, 2004 |
| 6766016 |
Supervisory control system |
Jul. 20, 2004 |
| 6549546 |
Call cut-off detection circuit for switch and method of the same |
Apr. 15, 2003 |
| 6498847 |
Dialer programming and device with integrated printing process |
Dec. 24, 2002 |
| 6411693 |
Long distance modem warning |
Jun. 25, 2002 |
| 6343300 |
File updating method capable of updating an operation file without interrupting online processing |
Jan. 29, 2002 |
| 6272212 |
Telephone intercept apparatus and method for intercepting an outgoing telephone number |
Aug. 7, 2001 |
| 6256379 |
Method and system for conveying supervision information |
Jul. 3, 2001 |
| 6192123 |
Method and apparatus for initiating telephone calls using a data network |
Feb. 20, 2001 |
| 6185294 |
Method and apparatus for installing telephone intercom-voice messaging apparatus at doorbell for dwelling |
Feb. 6, 2001 |
| 6154724 |
Energy based pulse position detector for telephone wire networks |
Nov. 28, 2000 |
| 6114970 |
Method of assigning a device identification |
Sep. 5, 2000 |
| 6088437 |
Call processing system, method and computer program product |
Jul. 11, 2000 |
| 6072869 |
Adaptive method and apparatus for detecting a stutter dial tone signal |
Jun. 6, 2000 |
| 6052459 |
Method and arrangement for signalling systems |
Apr. 18, 2000 |
| 6028927 |
Method and device for detecting the presence of a periodic signal of known period |
Feb. 22, 2000 |
| 5987121 |
Allowing stand-alone and local control of a single LED |
Nov. 16, 1999 |
| 5982874 |
Transmission system with improved tone detection |
Nov. 9, 1999 |
| 5982875 |
Process and apparatus for interaction between a telephone and its user |
Nov. 9, 1999 |
| 5970415 |
Method for handling collision of calls |
Oct. 19, 1999 |
| 5959372 |
Power management circuit |
Sep. 28, 1999 |
| 5943418 |
Ring-trip circuit |
Aug. 24, 1999 |
| 5937039 |
Method for sending out absent messages from ISDN exchange system |
Aug. 10, 1999 |
| 5933487 |
Method and apparatus for searching a plurality of destination numbers |
Aug. 3, 1999 |
| 5930349 |
Command signals generator circuit for telephonic fees indicators |
Jul. 27, 1999 |
| 5926523 |
Apparatus and method of recognizing establishment of speech channels in communication appliances connected in parallel to a common telephone line |
Jul. 20, 1999 |
| 5859905 |
Cycle-modulating type of dual-tone multifrequency generator |
Jan. 12, 1999 |
| 5859896 |
Telephone line automatic prefix dialer |
Jan. 12, 1999 |
| 5850436 |
Communication between a telephone and a computer system |
Dec. 15, 1998 |
| 5848149 |
Subscriber line interface and power circuit |
Dec. 8, 1998 |
| 5835581 |
Multi-function telephone dialer display |
Nov. 10, 1998 |
| 5732124 |
Apparatus and method for detecting the status of a PCM channel |
Mar. 24, 1998 |
| 5712910 |
Ring trip circuit having a simple trip detecting circuit of a high response speed |
Jan. 27, 1998 |
| 5692040 |
Method of and apparatus for exchanging compatible universal identification telephone protocols over a public switched telephone network |
Nov. 25, 1997 |
| 5675643 |
Line card that provides remote line activation and soft dialtone |
Oct. 7, 1997 |
| 5655012 |
Private branch exchange apparatus |
Aug. 5, 1997 |
| 5640449 |
Communications device to establish call in ISDN system |
Jun. 17, 1997 |
| 5636270 |
Method of producing signals commonly used with telephones |
Jun. 3, 1997 |
| 5612995 |
Method for activating a lamp on analog customer premises equipment by a digital signal |
Mar. 18, 1997 |
| 5515430 |
Volume controller |
May. 7, 1996 |
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