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/


git-svn-id: http://svn.digium.com/svn/asterisk/branches/1.8@291541 f38db490-d61c-443f-a65b-d21fe96a405b

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