AI Voice Agent DTMF Not Working: Why Digits Miss

Article automatically generated from technical news.

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 INVITE SDP for a=rtpmap:101 telephone-event/8000 before you change a single prompt. What this covers The three ways a keypress travels, and what kills each one