Merged revisions 297157,297486,297495 via svnmerge from

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

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  r297157 | mnicholson | 2010-12-01 13:47:33 -0600 (Wed, 01 Dec 2010) | 2 lines
  
  Changed some NOTICE and WARNING messages to DEBUG messages.
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  r297486 | mnicholson | 2010-12-02 15:30:47 -0600 (Thu, 02 Dec 2010) | 6 lines
  
  Add support for reserving a fax session before answering the channel.
  
  Note: this change breaks ABI compatibility.
  
  FAX-217
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  r297495 | mnicholson | 2010-12-03 09:21:52 -0600 (Fri, 03 Dec 2010) | 4 lines
  
  Print a DEBUG message instead of a WARNING message when the selected fax tech does not support reserving sessions.
  
  Answer the channel before quering it for t.38 support.  This is necessary for the query to work properly over local channels.
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@297496 65c4cc65-6c06-0410-ace0-fbb531ad65f3