Merged revisions 263949 via svnmerge from

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

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  r263949 | tilghman | 2010-05-19 01:32:27 -0500 (Wed, 19 May 2010) | 8 lines
  
  Because progress is called multiple times, across several frames, we must persist states when detecting multitone sequences.
  
  (closes issue #16749)
   Reported by: dant
   Patches: 
         dsp.c-bug16749-1.patch uploaded by dant (license 670)
   Tested by: dant
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