{TAIL ~ An inband signaling modem} communicates digital data over a voice channel in {HEAD ~ a digital wireless telecommunications network} 
{ TAIL ~ An inband signaling modem } communicates digital data over a voice channel in { HEAD ~ a digital wireless telecommunications network }
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD