The digital data is also encoded to prevent {HEAD ~ voice encoding circuitry} in {TAIL ~ the telecommunications network} from corrupting the synthesized audio tones representing the digital data 
in
The digital data is also encoded to prevent { HEAD ~ voice encoding circuitry } in { TAIL ~ the telecommunications network } from corrupting the synthesized audio tones representing the digital data
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH