Optimal Quality Adaptation for SLA-Based VoIP Services over DiffServ/MPLS Networks

This work proposes an optimal quality level adaptation mechanism based on contracted SLAs (service level agreement), and defines an optimal service policy for a VoIP (Voice over IP) application provider over DiffServ/MPLS networks. A VoIP application provider between VoIP users and network service providers faces the challenge of SLA mapping to maximize its profit and satisfy users´ requirements. The numerical results show that the proposed mechanism adapts the quality level of each active call to new network conditions well, and maximizes the profit under the constraints on the contracted SLAs. The contributions would help application providers develop CAC (call admission control) schemes and proprietary service policies efficiently.