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