Purges pending DTMF digits.
When a key is pressed on a phone keypad, it is stored in an internal buffer until retrieved or cleared in the script. If a key exists in the buffer, play statements are ignored.
If a key is pressed during a play statement, the recording is terminated immediately. This allows Users to fast-forward past recordings with which they are already familiar.
It is therefore good practice to clear the DTMF buffer before a prompt is played requesting a response.
@transferTarget::clearDtmf()
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