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#3: HTTP UA retrieves policies using provided URI. No asynchronous policy updates. #4: COPS UA has the role of a COPS Policy Enforcement Point (PEP), policy server has role of Policy Decision Point (PDP). UA submits policy requests to the policy server. Policies can be updated at any time by the policy server. #5: BEEP UA establishes a BEEP channel to the policy server. The UA sends the session description to the policy server and receives policies through this channel. Policies can be updated at any time by the policy server. Open Issue: Policy Channel Protocol (2) |