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The admission of multimedia streams with a particular and guaranteed level of QoS (Quality of Service) from source to destination with the goal of increasing revenue is challenging in multimedia communications over IP (Internet Protocol) networks. In this paper, we present SLA (Service Level Agreement) as an agreement between users and network operators, for the transmission of a multimedia stream with several choices of QoS level. Control of the admission of SLAs, to achieve maximum revenue while fully respecting QoS guarantees, is called SLA admission control. We present a scalable algorithm for the admission of SLAs.