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AI Voice Agent DTMF Not Working: Why Digits Miss

This story is from 2026-09-10. It is preserved in the archive; the latest stories are on the live feed.

A keypress can reach an IVR three ways: as in-band audio tones mixed into the call, as RFC 4733 telephone-event packets carried beside the audio, or as SIP INFO messages. Twilio's help centre states that Out of band RFC-2833 is supported. Out of band SIP INFO is not currently supported. Check the I…

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  1. 2026-09-10 15:30 · DEV Community — Machine Learning
    AI Voice Agent DTMF Not Working: Why Digits Miss

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