Review Board 1.7.16

dsp.c fix incorrect DTMF Digit_Duration, it's always short by 'hits_to_begin*DTMF_GSIZE', or 25.5ms if hitstobegin=2

Review Request #2145 - Created Oct. 4, 2012 and submitted

Alec Davis
1.8 to trunk
frawd, rmudgett
I'd seen this earlier, but thought nothing of it.

But frawd in ASTERISK-16003 was tring to get it corrected, it never happened.
Using PC based DTMF decoder, with various durations, and watching log/dtmf durations were 25ms closer to what was begin sent.
Review request changed
Updated (Oct. 4, 2012, 10:01 a.m.)
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