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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.
DTMF-Controlled Switch – HandsOn Tech
https://handsontec.com/index.php/dtmf-controlled-switch/
To hang up, T1 is switched off. The function of C5 is to inject a sound produced by the microcontroller. The DTMF tone decoder circuit includes R5, R6, R7, C9, C10, C11, X1 and IC2. IC2 (an MT8870) is a DTMF tone decoder IC. It receives the DTMF tones via R5, R6 and C9. The corresponding binary data of each code appears on the Q1-Q4 pins.
DTMF over IP – SIP INFO, Inband & RTP Events – Nick vs ...
https://nickvsnetworking.com/dtmf-over-ip-sip-info-inband-rtp-events/
DTMF (Dual Tone Modulated Frequency) aka touch tone, was initially designed to be a faster method of dialling since make-and-break dial pulses were slow and a more efficient method for user input was required switching was becoming digital.
DTMF - Genave
The DTMF code you hear is 461####333. Standard Whelen timing is 40 msec mark / 20 msec space. Listen to a Genave decoder responding to a code sent at a blazing DTMF rate of 20/5 also known as 40 digits per second. This is over twice as fast as Whelen, over three times faster than Federal Signal, and a whopping 20 times faster than Motorola.
Dual-tone multi-frequency signaling - Wikipedia
https://en.wikipedia.org/wiki/Dual-tone_multi-frequency_signaling
Dual-tone multi-frequency signaling ( DTMF) is a telecommunication signaling system using the voice-frequency band over telephone lines between telephone equipment and other communications devices and switching centers.
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