Merged revisions 285992 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.8

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  r285992 | diruggles | 2010-09-10 09:13:16 -0400 (Fri, 10 Sep 2010) | 1 line
  
  Added missing documentation for ExternalIVR feature added in January 2010
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@285993 65c4cc65-6c06-0410-ace0-fbb531ad65f3