Merged revisions 324914 via svnmerge from

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

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  r324914 | rmudgett | 2011-06-27 10:37:19 -0500 (Mon, 27 Jun 2011) | 21 lines
  
  When subscribing MWI to an unsolicited mailbox the first notification is incorrect.
  
  A remote peer subscribed to MWI with the unsolicited option and a local
  phone subscribed to the remote mailbox.  The notify message-summary events
  are sent correctly except for the first one when subscribing, which will
  always be 0.  This means the phone MWI indicator will be wrong until the
  mailbox read/unread count changes and the event is fired.
  
  Looks like this is a regression from ASTERISK-16149.
  
  * Fix the logic to check the cache and if allowed then fallback to
  manually counting mailbox messages.
  
  (closes issue ASTERISK-17997)
  Reported by: rsw686
  Patches:
        jira_asterisk_17997_v1.8.patch (license #5621) uploaded by rmudgett
  Tested by: rsw686
  
  JIRA SWP-3551
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@324915 65c4cc65-6c06-0410-ace0-fbb531ad65f3