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