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Credit Control Application Messages Credit Control Request (CCR) Sent from client to server to request authorization for a given service Credit Control Answer (CCA) Sent from server to client and carries the result of the corresponding authorization request Reauthorization Request (RAR) Sent by server to trigger a new CCR, e.g. after successful credit replenishment during a service Reauthorization Answer (RAA) Sent by client as an answer to RAR |