The access code allows {TAIL ~ the call} to be routed through {HEAD ~ a specific long distance service provider telephone network} 
The access code allows { TAIL ~ the call } to be routed through { HEAD ~ a specific long distance service provider telephone network }
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD