Merged revisions 229965 via svnmerge from

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

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  r229965 | file | 2009-11-13 11:19:59 -0600 (Fri, 13 Nov 2009) | 6 lines

  Document a limitation in the AVAILSTATUS variable from ChanIsAvail and provide
  a workaround for it that does not change existing behavior.

  (closes issue #14426)
  Reported by: macli
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@229966 65c4cc65-6c06-0410-ace0-fbb531ad65f3