asterisk users - Oct 2014 - OT: script to remove leading and trailing silence

Anybody care to share a script or snippet of what they use to remove 
leading and trailing silence from customer recorded files?

I've fiddled with sox to remove the leading; reverse the file; remove the 
now leading; and reverse the file again, but I'm not really happy with my
results.

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Thanks in advance,
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Steve Edwards       sedwards at sedwards.com      Voice: +1-760-468-3867 PST
Newline                                              Fax: +1-760-731-3000