An output then outputs {HEAD ~ the synthesized audio tones} to {TAIL ~ a voice channel} of a digital wireless telecommunications network 
to
An output then outputs { HEAD ~ the synthesized audio tones } to { TAIL ~ a voice channel } of a digital wireless telecommunications network
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH