Merged revisions 227827 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.4

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  r227827 | mnicholson | 2009-11-04 14:52:27 -0600 (Wed, 04 Nov 2009) | 10 lines
  
  This patch modifies the Dial application to monitor the calling channel for hangups while playing back announcements.
  
  (closes issue #16005)
  Reported by: falves11
  Patches:
        dial-announce-hangup-fix1.diff uploaded by mnicholson (license 96)
  Tested by: mnicholson, falves11
  
  Review: https://reviewboard.asterisk.org/r/407/
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@227829 65c4cc65-6c06-0410-ace0-fbb531ad65f3