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