Say a given digit string, returning early if any of the given DTMF digits are received on the channel.
EXAMPLE:
SAY DIGITS 5551212 “125#”
The digits five, five, five, one, two, one, two will be spoken out, If durning the speech, the DTMF keys 1, 2, 5 or # are pressed it will stop the playback.
Returns:
failure: 200 result=-1
success: 200 result=0
digit pressed: 200 result=<digit>
<digit> is the ascii code for the digit pressed.
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