Action: PlayDTMF
Synopsis: Play DTMF signal on a specific channel.
Privilege: call,all
Description: Plays a dtmf digit on the specified channel.
Variables: (all are required)
 Channel: Channel name to send digit to
 Digit: The dtmf digit to play
(NOTE: this is the *CLI help output.)

Sample Query (Asterisk v. 1.4.0):
 Action: PlayDTMF
 Channel: SIP/123-e2b2
 Digit: 1

Sample Response:
 Response: Success
 Message: DTMF successfully queued

Sample Error Response:
 Response: Error
 Message: No such channel
Note:This command is available in Asterisk 1.4 branch