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