Merged revisions 295516 via svnmerge from

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

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  r295516 | rmudgett | 2010-11-19 10:47:11 -0600 (Fri, 19 Nov 2010) | 13 lines
  
  Bring sig_analog extraction more into alignment with orig-trunk/v1.6.2 chan_dahdi.
  
  * Restore SMDI support.
  * Fixed initial value of struct analog_pvt.use_callerid.  It may get
  forced on depending upon other config options.
  * Call analog_dnd() instead of manual inlined code.
  * Removed unused struct analog_pvt.usedistinctiveringdetection.
  * Removed the struct analog_pvt.unknown_alarm flag.  It was really the
  struct analog_pvt.inalarm flag.
  * Use ast_debug() instead of ast_log(LOG_DEBUG).
  * Rename several function's index variable to idx.
  * Some formatting tweaks.
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@295517 65c4cc65-6c06-0410-ace0-fbb531ad65f3