Merged revisions 182281 via svnmerge from

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

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  r182281 | dvossel | 2009-03-16 12:47:42 -0500 (Mon, 16 Mar 2009) | 7 lines
  
  Randomize IAX2 encryption padding
  
  The 16-32 byte random padding at the beginning of an encrypted IAX2 frame turns out to not be all that random at all.  This patch calls ast_random to fill the padding buffer with random data.  The padding is randomized at the beginning of every encrypted call and for every encrypted retransmit frame.
  
  Review: http://reviewboard.digium.com/r/193/
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@182282 65c4cc65-6c06-0410-ace0-fbb531ad65f3