By way of example, less important data such as correspondence is transferred by packet switching and {TAIL ~ audio data} is transferred by {HEAD ~ line switching} 
By way of example , less important data such as correspondence is transferred by packet switching and { TAIL ~ audio data } is transferred by { HEAD ~ line switching }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD