[asterisk-users] Send DTMF digit every 15 seconds during a call

[PGentilini at intellicare.com]

I am trying to send a DTMF digit automatically every 15 seconds to keep a
call connected to an alarm panel.  I tried using the dial command L and
recording a dtmf tone for the beep, but obviously that didn't work.  Does
anyone have a suggestion for merging the L option and the sendDTMF or the D
option?  Any other suggestions would be appreciated!

Thanks!
Paul Gentilini