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