Waits up to <timeout> milliseconds for channel to receive a DTMF digit.

Use -1 for the <timeout> value if you desire the call to block indefinitely.

Returns:
failure: 200 result=-1
timeout: 200 result=0
success: 200 result=<digit>

<digit> is the ascii code for the digit received.

New in Asterisk 1.4.39:

Added extra functionality to AGI command WAIT FOR DIGIT. Add the ability to play a sound file, listen for more than just one digit, specify escape characters. Backwards compatible (to work with only timeout specified). (closes issue #15531)

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