How to get DTMF input with Background Audio on Asterisk

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Dual-tone multi-frequency (DTMF) is the sounds or tones generated by a telephone when the numbers are pressed. These tones are transmitted with the voice channel that is used to control automated equipment and signal user intent, such as the number they wish to dial. Each key has two tones at specific frequencies. • For more explanation on this video: https://www.linuxhelp.com/how-to-get-...

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