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