Merged revisions 227700 via svnmerge from

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

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  r227700 | file | 2009-11-04 15:17:39 -0400 (Wed, 04 Nov 2009) | 5 lines
  
  Fix a security issue where sending a REGISTER with a differing username in the From
  URI and Authorization header would reveal whether it was valid or not.
  
  (AST-2009-008)
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@227712 65c4cc65-6c06-0410-ace0-fbb531ad65f3