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Differentiated service network (DiffServ) provides an architecture that is scalable and capable of differentiating applications' quality of service (QoS). However, it could not control its loads under heavy traffic conditions, and it could not achieve assured service for TCP and UDP traffic-mixes if these flows are aggregated into a DiffServ class. This paper investigates these problems across multiple DiffServ domains. The paper suggests a solution that involves an edge-aware resource discovery (RD) feedback loop and fair intelligent admission control (FIAC) scheme for each DiffServ domain. The scheme is characterized by two fundamental features. First, the RD loop infers the availability of network resources, yet for scalability, it does not involve core routers. Second, the admission control module understands incoming traffic's requirements, reconciles with available resources via the RD loop, and admits traffic intelligently according to the FIAC algorithm. Multiple-domain control is obtained by concatenation of the RD loop and FIAC admission for each domain along the path from a source to a destination. Simulation results demonstrate that the enhanced DiffServ solution can admit traffic appropriately in terms of fairness and efficiency.