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Recent research efforts claim that dynamic per-class network resource over-provisioning is promising, since aggregated over-reservations allow to significantly reduce state, processing and signaling overheads. However, over-reservation must be carefully controlled to prevent waste of resources, which can be introduced by residual bandwidth (over-reserved but unused) of each Class of Service (CoS). Moreover, admission control can be compromised by inefficient over-reservation control mechanism, where excessive signaling can be placed under severe network conditions, such as congestion periods. In this scope, this paper proposes a novel Class-based resource Over-pRovisioning (COR) mechanism with novel techniques to: (a) over-provision CoSs by computing appropriate bandwidth over-allocation; (b) redistribute residual bandwidth among CoSs to avoid wasting resources. The performance evaluation shows the superiority of COR proposal over state-of-the-art solutions in optimizing the overall network performance, while preventing from bandwidth waste and unnecessary sessions blocking.