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