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