Define what network environment these IP packets will be crossing. In an integrated service environment, all routers are RSVP-enabled. A RSVP-enabled router has the ability to use the RSVP protocol. For example, let's assume that you are creating a policy to reserve resources for a video application to client A. To use this policy, not only will the applications (both client and server) need to be RSVP-enabled, but also the routers along this traffic's path will also need to be RSVP-enabled.
In contrast to an integrated service environment, you might have a hybrid environment. A hybrid environment contains both differentiated services-enabled and RSVP-enabled routers. A differentiated service-aware router has the ability to interpret the codepoint within the IP packet's header, but might not be able to use the RSVP protocol. In a hybrid environment, your traffic might not receive the priority you intend, but the connection will still be made.
Which environments do your applications cross?