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