Say a given number, returning early if any of the given DTMF digits are received on the channel.
EXAMPLE:
The number one thousand two hundred and thirty four will be spoken, and if the DTMFs 1, * or # is pressed during the speach it will be terminated.
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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