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QoS provisioning according to the DifTServ framework has raised the requirements for pricing mechanisms that preserve the potential and flexibility of DiffServ. At the same time, such mechanisms should reflect resource usage, allocate resources efficiently, reimburse costs or maximize service provision profits and lead customers to requesting services that will maximize their revenue. This work proposes a policy for pricing based on resource allocation by a particular category of DiffServ-based services for aggregated traffic in the case of transport networks. Our research takes into account the particularities that apply to the case of DiffServ services' provision over transport networks while imposing minimal overload and a-priori estimation of costs. The detailed pricing methodology is presented and experimentally evaluated.