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