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