Method and apparatus allows accurate detection of voice presence on a digitized communication line even in {HEAD ~ the presence} of {TAIL ~ tone signals} 
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Method and apparatus allows accurate detection of voice presence on a digitized communication line even in { HEAD ~ the presence } of { TAIL ~ tone signals }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL