Merged revisions 134161 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.4

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r134161 | tilghman | 2008-07-28 16:50:50 -0500 (Mon, 28 Jul 2008) | 7 lines

Detect when sox fails to raise the volume, because sox can't read the file.
(closes issue #12939)
 Reported by: rickbradley
 Patches: 
       20080728__bug12939.diff.txt uploaded by Corydon76 (license 14)
 Tested by: rickbradley

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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@134163 65c4cc65-6c06-0410-ace0-fbb531ad65f3