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