Merged revisions 283173 via svnmerge from

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

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  r283173 | russell | 2010-08-23 06:58:34 -0500 (Mon, 23 Aug 2010) | 5 lines
  
  Expand cel_custom.conf.sample.
  
  Include the usage of CSV_QUOTE() to ensure data has valid CSV formatting.  Also list
  the special CEL variables that are available for use in the mapping.
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@283174 65c4cc65-6c06-0410-ace0-fbb531ad65f3