Sends arbitrary DTMF digits
It will send all digits or terminate if it encounters an error.
digits- List of digits 0-9,*#,a-d,A-D to send also w for a half second pause, W for a one second pause, and f or F for a flash-hook if the channel supports flash-hook.
timeout_ms- Amount of time to wait in ms between tones. (defaults to .25s)
duration_ms- Duration of each digit
channel- Channel where digits will be played
This documentation was imported from Asterisk Version SVN-branch-13-r420538