Merged revisions 328162 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.10

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  r328162 | mnicholson | 2011-07-14 12:46:32 -0500 (Thu, 14 Jul 2011) | 3 lines
  
  tune the v21 preamble detector to properly detect the desired sequence of hits
  and misses
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@328163 65c4cc65-6c06-0410-ace0-fbb531ad65f3