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Class Information
Number: 379/257
Name: Telephonic communications > Centralized switching system > With generating of call associated substation signal > For calling station (e.g., status or progress tones)
Description: Subject matter where a line condition responsive or call associated signal is transmitted back to the calling terminal.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7587040 |
Systems and methods for detecting false signals on an outbound call |
Sep. 8, 2009 |
| 7421071 |
Call progress tone generation in a communication system |
Sep. 2, 2008 |
| 7203304 |
Call progress tone generation in a communication system |
Apr. 10, 2007 |
| 7072644 |
Method for providing a caller-based ringback tone sound in case of a non-subscribed called |
Jul. 4, 2006 |
| 7050564 |
Call progress tone generation in a communication system |
May. 23, 2006 |
| 7013393 |
Universal intelligent card for secure access to system functions |
Mar. 14, 2006 |
| 6985570 |
Method for the establishment of a telecommunication link |
Jan. 10, 2006 |
| 6744876 |
Tone sending device of electronic private branch exchange |
Jun. 1, 2004 |
| 6404863 |
First party signalling for call waiting calling number identification (CWCID) system |
Jun. 11, 2002 |
| 6201854 |
System and method for telephone number verification and identification |
Mar. 13, 2001 |
| 6148072 |
Methods and systems for initiating video communication |
Nov. 14, 2000 |
| 6088440 |
Method and apparatus for operating a telephone exchange having selectable audio sources |
Jul. 11, 2000 |
| 5937039 |
Method for sending out absent messages from ISDN exchange system |
Aug. 10, 1999 |
| RE36228 |
Call progress capability for a switched channel data service unit |
Jun. 15, 1999 |
| 5862212 |
Method and structure for detecting a customer premises equipment alerting signal |
Jan. 19, 1999 |
| 5859904 |
Methods and systems for connecting multiple telephone lines between two stations |
Jan. 12, 1999 |
| 5793858 |
Method for improving call completion rates in telephony |
Aug. 11, 1998 |
| 5790287 |
Optical communication system with improved maintenance capabilities |
Aug. 4, 1998 |
| 5781625 |
System and apparatus for generating within the premises a dial tone for enhanced phone services |
Jul. 14, 1998 |
| 5748637 |
DTMF signaling on four-wire switched 56 KBPS lines |
May. 5, 1998 |
| 5692040 |
Method of and apparatus for exchanging compatible universal identification telephone protocols over a public switched telephone network |
Nov. 25, 1997 |
| 5642407 |
System and method for selected audio response in a telecommunications network |
Jun. 24, 1997 |
| 5642406 |
Tone recognition method using tone learning operation in an automatic answering system |
Jun. 24, 1997 |
| 5638437 |
Telecommunication system and method enabling a user to get access to an automated call processing from a central station operating on pulse dialling mode |
Jun. 10, 1997 |
| 5583933 |
Method and apparatus for the secure communication of data |
Dec. 10, 1996 |
| 5557658 |
Communications marketing system |
Sep. 17, 1996 |
| 5539814 |
Method and apparatus for informing active subscriber of disconnection of held subscriber in call-waiting service |
Jul. 23, 1996 |
| 5535264 |
Prompt issuing protocol for an intercept voice messaging system |
Jul. 9, 1996 |
| 5530743 |
Telephone exchange apparatus and tone sending method in telephone exchange apparatus |
Jun. 25, 1996 |
| 5506885 |
Method of adapting processing parameters in a call processing system |
Apr. 9, 1996 |
| 5457690 |
DTMF Signaling on four-wire switched 56 Kbps Lines |
Oct. 10, 1995 |
| 5436964 |
Programmable call progress tones for a switching system |
Jul. 25, 1995 |
| 5428670 |
Communications marketing system |
Jun. 27, 1995 |
| 5363435 |
Method and apparatus for seizing a trunk circuit in a telecommunications private branch exchange |
Nov. 8, 1994 |
| 5353342 |
Adaptive multitone signaling method |
Oct. 4, 1994 |
| 5321740 |
Telephone marketing system |
Jun. 14, 1994 |
| 5305313 |
Electronic switching system for use in connection to an ISDN and method of setting communication disconnection reasons |
Apr. 19, 1994 |
| 5265157 |
Answer supervision and service selection |
Nov. 23, 1993 |
| RE34380 |
Method and apparatus for applying messages in a telecommunications network |
Sep. 14, 1993 |
| 5233641 |
Radio telephone equipment having a sounding device for generating alert tone indicative of response of called subscriber |
Aug. 3, 1993 |
| 5206900 |
Automated attendant |
Apr. 27, 1993 |
| 5134651 |
Method and apparatus for providing answer supervision and an autonomous pay telephone incorporating the same |
Jul. 28, 1992 |
| 5109409 |
Apparatus and method to detect telephony signaling states |
Apr. 28, 1992 |
| 5060259 |
Call progress capability for a switched channel data service unit |
Oct. 22, 1991 |
| 5029197 |
Automatic dialing and responding device |
Jul. 2, 1991 |
| 5020099 |
Private branch exchange |
May. 28, 1991 |
| 5014300 |
Method and apparatus for accessing a facsimile store and forward network |
May. 7, 1991 |
| 4995076 |
Call progress capability for a switched channel data service unit |
Feb. 19, 1991 |
| 4811382 |
Method and apparatus for applying messages in a telecommunications network |
Mar. 7, 1989 |
| 4775975 |
Dial tone detection arrangement with a detection notification feature |
Oct. 4, 1988 |
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