Merged revisions 376916,376920 via svnmerge from

Merged revisions 376916,376920 via svnmerge from
file:///srv/subversion/repos/asterisk/branches/10

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  r376916 | mmichelson | 2012-11-30 10:23:46 -0600 (Fri, 30 Nov 2012) | 23 lines

  Fix potential crashes during SIP attended transfers.

  The principal behind this patch is simple. During a transfer,
  we manipulate channels that are owned by a separate thread than
  the one we currently are running in, so it makes sense that we
  need to grab a reference to the channels so that they cannot
  disappear out from under us.

  In the wild, crashes were sometimes seen when the transferring
  party would hang up the call before the transfer target answered
  the call. The most common place to see the crash occur was when
  attempting to send a connected line update to the transferer
  channel.

  (closes issue ASTERISK-20226)
  Reported by Jared Smith
  Patches:
  	ASTERISK-20226.patch uploaded by Mark Michelson (License #5049)
  Tested by: Jared Smith
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  Merged revisions 376901 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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  r376920 | seanbright | 2012-11-30 11:06:21 -0600 (Fri, 30 Nov 2012) | 5 lines

  Minor spelling fix to the VOLUME documentation.
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  Merged revisions 376919 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/10-digiumphones@376948 65c4cc65-6c06-0410-ace0-fbb531ad65f3