Merged revisions 182525 via svnmerge from

https://origsvn.digium.com/svn/asterisk/trunk

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  r182525 | kpfleming | 2009-03-17 09:38:11 -0500 (Tue, 17 Mar 2009) | 11 lines
  
  Improve behavior of ast_answer() to not lose incoming frames
  
  ast_answer(), when supplied a delay before returning to the caller, use ast_safe_sleep() to implement the delay. Unfortunately during this time any incoming frames are discarded, which is problematic for T.38 re-INVITES and other sorts of channel operations.
  
  When a delay is not passed to ast_answer(), it still delays for up to 500 milliseconds, waiting for media to arrive. Again, though, it discards any control frames, or non-voice media frames.
  
  This patch rectifies this situation, by storing all incoming frames during the delay period on a list, and then requeuing them onto the channel before returning to the caller.
  
  http://reviewboard.digium.com/r/196/
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git-svn-id: http://svn.digium.com/svn/asterisk/branches/1.6.0@182526 f38db490-d61c-443f-a65b-d21fe96a405b

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