Merged revisions 306674 via svnmerge from

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

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  r306674 | twilson | 2011-02-07 14:43:22 -0800 (Mon, 07 Feb 2011) | 24 lines
  
  Merged revisions 306673 via svnmerge from 
  https://origsvn.digium.com/svn/asterisk/branches/1.6.2
  
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    r306673 | twilson | 2011-02-07 14:40:20 -0800 (Mon, 07 Feb 2011) | 17 lines
    
    Merged revisions 306672 via svnmerge from 
    https://origsvn.digium.com/svn/asterisk/branches/1.4
    
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      r306672 | twilson | 2011-02-07 14:35:20 -0800 (Mon, 07 Feb 2011) | 10 lines
      
      Don't try to pickup a call in the middle of a masquerade
      
      If A calls B which doesn't answer and C & D both try to do a call pickup, it is
      possible for ast_pickup_call to answer the call, then fail to masquerade one of
      the calls because the other one is already in the process of masquerading. This
      patch checks to see if the channel is in the process of masquerading before
      call before selecting it for a pickup.
      
      Review: https://reviewboard.asterisk.org/r/1094/
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@306675 65c4cc65-6c06-0410-ace0-fbb531ad65f3