A single unified method call is made to policy adapters in response to the mediated customer request, each of {TAIL ~ the policy adapters} in communication with {HEAD ~ a policy server} 
A single unified method call is made to policy adapters in response to the mediated customer request , each of { TAIL ~ the policy adapters } in communication with { HEAD ~ a policy server }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD