H04Q1/45 - CPC Classification Index

ClassID:

231189 ⎘

H04Q1/45 - CPC Classification

Classification description:

Details of selecting apparatus or arrangements; Electrical details; Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling

Sub-classes:

H04Q1/453 » in which m-out-of-n signalling frequencies are transmitted 5
H04Q1/457 » with conversion of multifrequency signals into digital signals 13

Recent Application in this class:

20240422545

2024-12-19

SYSTEM, METHOD, AND APPARATUS FOR DETECTING CALL INTERCEPTION

20240323270

2024-09-26

CALL CLASSIFICATION THROUGH ANALYSIS OF DTMF EVENTS

20220337924

2022-10-20

Call classification through analysis of DTMF events

20210152897

2021-05-20

Call classification through analysis of DTMF events

20200313913

2020-10-01

Smart power adapter

20200299100

2020-09-24

Elevator system

20190238956

2019-08-01

Call classification through analysis of DTMF events

20180131795

2018-05-10

Telephone switching apparatus and method, and program

20180041823

2018-02-08

Call classification through analysis of DTMF events

#10

20170359632

2017-12-14

Method of Inter-Frequency or Inter-Radio Access Technology Measurement

#11

20160088142

2016-03-24

Voice-operated interface for DTMF-controlled systems

#12

20150057051

2015-02-26

Voice-operated interface for DTMF-controlled systems

#13

20140369489

2014-12-18

Method for handling a telecommunications connection, telecommunications arrangement, switching device and network coupling device

#14

20140011544

2014-01-09

Voice-operated interface for DTMF-controlled systems

#15

20130028404

2013-01-31

Audio conference platform with dynamic speech detection threshold

#16

20120236845

2012-09-20

Voice and data exchange over a packet based network

#17

20120047216

2012-02-23

Method and apparatus for telephonically accessing and navigating the internet

#18

20110249771

2011-10-13

Adaptive gain control based on echo canceller performance information

#19

20110243127

2011-10-06

Voice and data exchange over a packet based network

#20

20110182168

2011-07-28

Interaction between echo canceller and packet voice processing

#21

20110058496

2011-03-10

Voice-activity detection based on far-end and near-end statistics

#22

20110051924

2011-03-03

Voice and data exchange over a packet based network with echo cancellation

#23

20100183126

2010-07-22

In-band signaling in interactive communications

#24

20090240826

2009-09-24

Using RTCP statistics for media system control

#25

20090109881

2009-04-30

Voice and data exchange over a packet based network

#26

20090103573

2009-04-23

Voice and data exchange over a packet based network with DTMF

#27

20090080415

2009-03-26

Late frame recovery method

#28

20080285594

2008-11-20

System and method for adapting analog systems to communicate with packet networks

#29

20080188211

2008-08-07

Method for informing a subscriber of a mobile telephony network about missed calls

#30

20080049647

2008-02-28

Voice-activity detection based on far-end and near-end statistics

#31

20080037475

2008-02-14

Data rate controller

#32

20080031429

2008-02-07

Method and apparatus for telephonically accessing and navigating the internet

#33

20070242808

2007-10-18

Method and apparatus for telephonically accessing and navigating the internet

#34

20070241941

2007-10-18

Method and apparatus for telephonically accessing and navigating the internet

#35

20070150264

2007-06-28

Voice and data exchange over a packet based network with voice detection

#36

20070133417

2007-06-14

Late frame recovery method

#37

20070127711

2007-06-07

Adaptive gain control based on echo canceller performance information

#38

20070121823

2007-05-31

Method and apparatus for telephonically accessing and navigating the internet

#39

20070116211

2007-05-24

Supervisory communication system serving callers with restricted freedom

#40

20070091873

2007-04-26

Voice and data exchange over a packet based network with DTMF

#41

20070071217

2007-03-29

Method and system for accessing intelligent network and related devices

#42

20070032223

2007-02-08

Methods and devices for SMS dialing assistance

#43

20070025480

2007-02-01

Voice and data exchange over a packet based network with AGC

#44

20070003037

2007-01-04

Method and system for automatic generation and testing of voice applications

#45

20060135137

2006-06-22

System and method for providing integrated communication id

#46

20060109970

2006-05-25

Method and apparatus for changing a sound source of a supplementary service using a ring back tone on calling

#47

20060068816

2006-03-30

Network based contacts with optional DTMF exchange of the same

#48

20060047516

2006-03-02

Method for processing audio data on a network and device therefor

#49

20050276411

2005-12-15

Interaction between echo canceller and packet voice processing

#50

20050144445

2005-06-30

Adapter for secure VoIP communications

#51

20050111363

2005-05-26

Operating system for telecommunications

#52

20050069114

2005-03-31

Method and apparatus for improving nuisance signals in audio/video conference

#53

20050069106

2005-03-31

Method and apparatus for enabling a privacy feature in a communications network

#54

20050013415

2005-01-20

Craft menu system using caller ID functionality for installation and testing

#55

15816841

2019-04-16

Method and apparatus for intelligent dual-tone multi-frequency (DTMF) decoding and identification

#56

14027433

2015-11-03

Multiple-frequency signal classification through use of a second-order statistic

#57

14011815

2018-12-04

Detection and identification of synchronizing signals embedded in voice or data

#58

13947461

2015-07-28

DTMF circuit and method of relaying DTMF digits in a DTMF circuit