RFC2753 - A Framework for Policy-based Admission Control

   Figure 3: Relationship between PEP and other int-serv components
   within an RSVP router. PC -- Packet Classifier, PS -- Packet
   Scheduler

   When a RSVP message arrives at the router (or an RSVP related event
   requires a policy decision), the RSVP module is expected to hand off
   the request (corresponding to the event or message) to its PEP
   module. The PEP will use the PDP (and LPDP) to obtain the policy
   decision and communicate it back to the RSVP module.

4.2. Additional functionality at the PDP

   Typically, PDP returns the final policy decision based on an
   admission control request and the associated policy elements.
   However, it should be possible for the PDP to sometimes ask the PEP

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