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Class Information
Number: 379/418
Name: Telephonic communications > Call signal generating (e.g., ringing or tone generator)
Description: Subject matter which produces an electrical signal which actuates a device producing a perceptible signal indicative of the status or presence of a desired call connection.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7339924 |
Method and apparatus for providing ringing timeout disconnect supervision in remote telephone extensions using voice over packet-data-network systems (VOPS) |
Mar. 4, 2008 |
| 7324331 |
System and method for providing and receiving electric power through telephone wire-pairs |
Jan. 29, 2008 |
| 7260210 |
Unbalanced slic with a built-in ring circuit |
Aug. 21, 2007 |
| 7257222 |
Ring voltage generation circuit and method for generating a ring voltage |
Aug. 14, 2007 |
| 7251321 |
Crescendo telephone ringer |
Jul. 31, 2007 |
| 7239695 |
Method and apparatus for detecting line card threshold |
Jul. 3, 2007 |
| 7212840 |
Cellular phone and incoming call reception informing method |
May. 1, 2007 |
| 7197134 |
DTMF generating assistant |
Mar. 27, 2007 |
| 7181003 |
Direct drive for a subscriber line differential ringing signal |
Feb. 20, 2007 |
| 7181004 |
Direct drive for a subscriber line differential ringing signal having a DC offset |
Feb. 20, 2007 |
| 7181005 |
Telephone interface circuit |
Feb. 20, 2007 |
| RE39406 |
Telephone line coupler |
Nov. 21, 2006 |
| RE39231 |
Communication terminal equipment and call incoming control method |
Aug. 8, 2006 |
| 7068777 |
True DTMF dialer |
Jun. 27, 2006 |
| 7067731 |
Sound source circuit and telephone terminal using same |
Jun. 27, 2006 |
| 7046797 |
Telephone system with controllable ringing voltage |
May. 16, 2006 |
| 7043012 |
Method and apparatus for ring again feature for a telephone system |
May. 9, 2006 |
| 7042996 |
Method and apparatus for cas-based ring limiting of FXS ports |
May. 9, 2006 |
| 7031464 |
Ring relay control unit for foreign exchange station |
Apr. 18, 2006 |
| 7031465 |
Network interface device and method |
Apr. 18, 2006 |
| 7020280 |
Method of processing phone dialing/redialing function and the device thereof |
Mar. 28, 2006 |
| 7016706 |
Mobile radio terminal |
Mar. 21, 2006 |
| 7013393 |
Universal intelligent card for secure access to system functions |
Mar. 14, 2006 |
| 6996228 |
Motor for generating vibrational signal |
Feb. 7, 2006 |
| 6961425 |
Socket/plug in DTMF tone dialer |
Nov. 1, 2005 |
| 6961424 |
Protected mechanism for DTMF relay |
Nov. 1, 2005 |
| 6954531 |
Software controlled ring voltage generator |
Oct. 11, 2005 |
| 6944284 |
Pulsed volume control of a magnetic ringer |
Sep. 13, 2005 |
| 6940974 |
Systems and methods for generating tones for operating telephones |
Sep. 6, 2005 |
| 6920220 |
Pre-zero crossing signal generator for sinusoidal voltages with DC offsets such as telephone ring voltages |
Jul. 19, 2005 |
| 6882862 |
Method for interfacing a private branch exchange with a wireless communications network and also with the public switched telephone network |
Apr. 19, 2005 |
| 6879687 |
Apparatus for sending a ringing signal and data with reduced impulse noise |
Apr. 12, 2005 |
| 6873705 |
Combine audio and ringing mode |
Mar. 29, 2005 |
| 6850617 |
Telephone receiver circuit with dynamic sidetone signal generator controlled by voice activity detection |
Feb. 1, 2005 |
| 6813353 |
Redundant operation of ring voltage generators utilizing voltage bus segmentation for fault isolation |
Nov. 2, 2004 |
| 6798879 |
Remote telephone call notification system |
Sep. 28, 2004 |
| 6771641 |
DTMF digit collection and transportation for a packet network |
Aug. 3, 2004 |
| 6751323 |
Electroacoustic apparatus having ringing signal generation means capable of producing a subjective bass perception |
Jun. 15, 2004 |
| 6748075 |
Telephone and cordless telephone |
Jun. 8, 2004 |
| 6718037 |
Computer with a modem capable of outputting telephone bell signals |
Apr. 6, 2004 |
| 6714644 |
Ringing scheduling for FXS ports on platforms with limited power supply |
Mar. 30, 2004 |
| 6707895 |
Telephone line management system |
Mar. 16, 2004 |
| 6694010 |
Recognition of a single frequency tone |
Feb. 17, 2004 |
| 6690792 |
Active decoupling and power management circuit for line-powered ringing generator |
Feb. 10, 2004 |
| 6687369 |
Telephone signal discriminator |
Feb. 3, 2004 |
| 6678374 |
Tone based answer detection for IP based telephones |
Jan. 13, 2004 |
| 6665398 |
Programmable subscriber loop interface circuit and method |
Dec. 16, 2003 |
| 6661891 |
Method and apparatus for detecting an activation tone |
Dec. 9, 2003 |
| 6650751 |
Answer detection for IP based telephones using passive detection |
Nov. 18, 2003 |
| 6618600 |
Distinctive ringing in a wireless centrex system |
Sep. 9, 2003 |
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