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