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The P-CSCF is a central IMS core element for SIP signaling but it also performs an important role in the PCC architecture. It is the only element that receives information about the user signaling for multimedia sessions. It sends a description of the session the user tries to establish to the PCRF through the Rx interface. The PCRF is the element which authorizes the session and does the policy control and flow based charging. It sends through the Gx interface commands to the PCEF which is co-located with the domain gateway (e.g. a GGSN or a WAG) and whose role is to enforce the policies that the PCRF requires. |
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