Merged revisions 344493 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/10

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  r344493 | dvossel | 2011-11-10 15:54:42 -0600 (Thu, 10 Nov 2011) | 12 lines
  
  Fixes issue with ConfBridge participants hanging up during DTMF feature menu usage getting stuck in conference forever.
  
  When a conference user enters the DTMF menu they are suspended from the
  bridge while the channel is handed off to the DTMF feature code.  If a
  user entered this state and hungup, there existed a race condition where
  the channel could not exit the conference because it was waiting on a
  signal that would never arrive.  This patch fixes that, because it would
  stupid for me to talk about the problem and commit a patch for something else.
  
  (closes issue ASTERISK-18829)
  Reported by: zvision
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@344494 65c4cc65-6c06-0410-ace0-fbb531ad65f3