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DTMF Audio Adjustments for Transmitters - Genave
http://genave.com/dtmf-audio-adjustments/#:~:text=DTMF%20signals%20can%20be%20sent%20over%20copper%20wire%2C,technology%20to%20seek%20out%20the%20DTMF%20tone%20pairs.
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. WebRTC currently ignores these …
DTMF Audio Adjustments for Transmitters - Genave
http://genave.com/dtmf-audio-adjustments/
DTMF signals can be sent over copper wire, FM radio, microwave systems and any other medium which can handle normal audio. DTMF is very forgiving and adaptable, but there are a few guidelines which should be observed when sending the signals. DTMF has great hearing. DTMF decoders use active technology to seek out the […]
DTMF issues and problems when using VoIP.
https://www.voipmechanic.com/dtmf-issues.htm
In some VoIP routes a switch may be configured to detect in-band DTMF which is sent by the VoIP ATA, but then switches to an out of band RFC2833 DTMF required for an upstream provider. This upstream carrier then terminates the call to the PSTN, possibly to a voice mail system, which will require regeneration of the audible inband DTMF tones.
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