Merged revisions 304007 via svnmerge from

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

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  r304007 | rmudgett | 2011-01-25 17:28:25 -0600 (Tue, 25 Jan 2011) | 22 lines
  
  Merged revisions 304006 via svnmerge from 
  https://origsvn.digium.com/svn/asterisk/branches/1.6.2
  
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    r304006 | rmudgett | 2011-01-25 17:25:32 -0600 (Tue, 25 Jan 2011) | 15 lines
    
    Merged revisions 304005 via svnmerge from 
    https://origsvn.digium.com/svn/asterisk/branches/1.4
    
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      r304005 | rmudgett | 2011-01-25 17:21:09 -0600 (Tue, 25 Jan 2011) | 8 lines
      
      DTMF attended transfers sometimes fail for no apparent reason.
      
      The loop in feature_request_and_dial() can exit when Party C has answered
      without processing an AST_CONTROL_ANSWER.  Also sometimes an
      AST_CONTROL_ANSWER never happens even though Party C has answered.
      
      Don't hangup Party C if he is up or we receive an AST_CONTROL_ANSWER.
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@304008 65c4cc65-6c06-0410-ace0-fbb531ad65f3