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DTMF Indication over HD Audio Codecs
https://docs.oracle.com/en/industries/communications/session-border-controller/8.3.0/acliconfiguration/dtmf-indication-hd-audio-codecs.html#:~:text=DTMF%20Indication%20over%20HD%20Audio%20Codecs%20When%20performing,that%20match%20those%20of%20the%20HD%20audio%20codecs.
DTMF Indication over HD Audio Codecs
https://docs.oracle.com/en/industries/communications/session-border-controller/8.3.0/acliconfiguration/dtmf-indication-hd-audio-codecs.html
DTMF Indication over HD Audio Codecs When performing DTMF transcoding while HD Audio codecs are present, Oracle Communications Session Border Controller accounts for telephone-event tone indication at clock rates that match those of the HD audio codecs.
DTMF issues and problems when using VoIP.
https://www.voipmechanic.com/dtmf-issues.htm
The switch has to detect and remove the tone sent by the ATA from the audio stream because the upstream provider specified RFC2833 DTMF. At times the switch can't always completely remove the in-band DTMF tone which is a problem, because by the time it has detected the DTMF tone, it has already passed a short amount of it.
Online DTMF Tone Generator - Audio Check
https://www.audiocheck.net/audiocheck_dtmf.php
Dual-Tone Multi-Frequency (DTMF) is the signal that you generate when you press an ordinary telephone's touch keys. Over the years, DTMF has replaced Pulse dialing, the early type of telephone dialing in which short pulses were used to relay the dialed number. With DTMF, each keypress on your phone generates tones made of two specific ...
What is: DTMF? | VoiceVision - IVR and Contact Center ...
http://www.voicevisionivr.com/blog/what-is-dtmf
Over regular phone lines, DTMF is sent as audio. VoIP phones are designed to carry voice only, but can send DTMF as a data packet over the internet. This data packet contains a close match to the DTMF but not an exact representation. Sending DTMF over VoIP may create either a duplicated digit or no digit at all on the receiving end.
DTMF over IP – SIP INFO, Inband & RTP Events – Nick vs ...
https://nickvsnetworking.com/dtmf-over-ip-sip-info-inband-rtp-events/
In-band because the DTMF tones are carried in the audio stream like they would if you were to playback those tones on a tape recorder or harmonised whistling. However along came G.729 and other compressed codecs and suddenly these two tones were lost in compression, so the VoIP world needed a new way to transport DTMF information.
Using DTMF with WebRTC - Web APIs | MDN
https://developer.mozilla.org/en-US/docs/Web/API/WebRTC_API/Using_DTMF
The DTMF system is often referred to as "touch tone," after an old trade name for the system. WebRTC doesn't send DTMF codes as audio data. Instead, they're sent out-of-band, as RTP payloads. Note, however, that although it's possible to send DTMF using WebRTC, there is currently no way to detect or receive incoming DTMF.
DTMF Tones and Signaling Explained - OnSIP
https://www.onsip.com/voip-resources/voip-fundamentals/dtmf-tones-and-signaling-explained
The DTMF keypad. Eight different frequency signals are assigned to the columns and rows of the keypad. ( Source) Signal Pairing DTMF works by assigning eight different audio frequencies to the rows and columns of the keypad. The columns on the keypad are assigned high-frequency signals, while the rows are assigned low-frequency signals.
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