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UA provides session information to policy server. UA describes the aspects of the session it wants to set up. IP addresses, ports, codecs, media types, bandwidth estimate,… “Ask if described session is permitted.” Policy server responds with a policy. The types of policy responses are possible: Allow the session as it was proposed. Allow the session if the supplied policies are applied. Reject the session. Policies may be updated during a session. “Return acceptance decision possibly requiring changes to the session.” General Usage Pattern |