Merged revisions 291541 via svnmerge from

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

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  r291541 | rmudgett | 2010-10-13 15:21:02 -0500 (Wed, 13 Oct 2010) | 26 lines
  
  The chan_dahdi faxdetect option only works for the first FAX call.
  
  The chan_dahdi faxdetect option only works for the first call.  After that
  the option no longer works.  The struct dahdi_pvt.callprogress member is
  the encoded user config setting for the callprogress and faxdetect config
  options.  Changing this value alters the configuration for all following
  calls until the chan_dahdi.conf file is reloaded.
  
  * Fixed the chan_dahdi ast_channel_setoption callback to not change the
  users faxdetect config setting except for the current call.
  
  * Fixed the chan_dahdi ast_channel_queryoption callback to read the active
  DSP setting of the faxdetect option.
  
  * Made actually disable the active faxdetect DSP setting for the current
  call on the analog port.  my_handle_dtmfup() is used for normal analog
  ports.  dahdi_handle_dtmfup() is the legacy code and is no longer used
  unless in a radio mode.
  
  (closes issue #18116)
  Reported by: seandarcy
  Patches:
        issue18116_v1.8.patch uploaded by rmudgett (license 664)
  
  Review: https://reviewboard.asterisk.org/r/972/
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@291542 65c4cc65-6c06-0410-ace0-fbb531ad65f3