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