Reported by: litnialex
If a DTMF end frame comes from a channel without a begin and it is going to a technology that only accepts end frames (aka INFO) then use the minimum DTMF duration if one is not in the frame already.
git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@77460 65c4cc65-6c06-0410-ace0-fbb531ad65f3