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![]() The trouble with sending DTMF in-band is that the codecs used may distort the DTMF tones and subsequently make them unrecognizable to the receiving system or device. These are used to navigate voicemail prompts, auto-attendants, IVRs, and the like after a call has already been established. DTMF (dual tone multi-frequency) is in simpler terms, the tones that are generated when you press a digit on the keypad. ![]()
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