B.106. SendDTMF()

Send DTMF digits on the channel.
Sends the specified DTMF sequence on the channel. Permitted symbols are 0-9, *, # and A-D. Additionally w is allowed; it indicates a pause of 500 ms. The argument timeout_ms sets the pause in milliseconds between tones. If not specified, defaults to 250 ms.
Returns 0, or -1 if the channel is hung up.
exten => 123,1,SendDTMF(123w456w789,200)


Internal help for this application in Asterisk 1.4:
  -= Info about application 'SendDTMF' =- 

Sends arbitrary DTMF digits

 SendDTMF(digits[|timeout_ms]): Sends DTMF digits on a channel. 
 Accepted digits: 0-9, *#abcd, w (.5s pause)
 The application will either pass the assigned digits or terminate if it
 encounters an error.
diff output to internal help in Asterisk 1.2:
- none -