This document describes a simple client/server model for supporting
policy control over QoS signaling protocols. The model does not make
any assumptions about the methods of the policy server, but is based
on the server returning decisions to policy requests. The model is
designed to be extensible so that other kinds of policy clients may
be supported in the future. However, this document makes no claims
that it is the only or the preferred approach for enforcing future
types of policies.