nurselosa.blogg.se - Twilio dtmf

These methods may be the default DTMF setting for some VoIP phones systems. SIP INFO DTMF, and in-band DTMF are not supported by. This transmits the keypresses over as specific event packets - rather than sounds within the audio stream - to make keypresses easier to identify and collect, and reduce the effects of poor line or audio quality.

The TwiML verb is only able to detect DTMF keypress inputs in the RFC 2833 / 4733 standard. Problems might also arise if a user presses a key too quickly for the DTMF to be interpreted. Twilio only receives structured data and does not interpret the DTMF.īy the time we reach step 3, the audible DTMF tone will have been replaced with indistinguishable clicks where the sounds used to be, so there's no possibility that Twilio is interpreting the key presses incorrectly.

Twilio receives structured data indicating which key was pressed.

This structured data is then sent parallel to, but not as part of, the audio of the call. One of these carriers (not always the same one) interprets the DTMF tones and translates the audio data into structured data.

The call passes through several carriers.

The user presses a key and produces DTMF tones.

DTMF have been standardized so that they can be understood and decoded by machines. When a user presses a key on their phone, the key press produces Dual-tone multi-frequency signaling (DTMF), which is the source of the familiar sounds you hear when dialing a phone. The TwiML verb works by passing data from touch-tone key presses along to your application.