Merged revisions 188646 via svnmerge from

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

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  r188646 | dvossel | 2009-04-15 17:08:40 -0500 (Wed, 15 Apr 2009) | 12 lines
  
  National prefix inserted even when caller ID not available
  
  When the caller ID is restricted, the expected behavior is for the caller id to be blank.  In chan_dahdi, the national prefix is placed onto the callers number even if its restricted (empty) causing the caller id to be the national prefix rather than blank.
  
  (closes issue #13207)
  Reported by: shawkris
  Patches:
        national_prefix.diff uploaded by dvossel (license 671)
  
  Review: http://reviewboard.digium.com/r/220/
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@188647 65c4cc65-6c06-0410-ace0-fbb531ad65f3