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For time-delayed dependent scalable differentiated services (DiffServ) networks the use of robust control techniques are essential for addressing the congestion control problem. Sliding mode-based variable structure control (SM-VSC) technique robustness capabilities are utilized in this paper to design on the basis of an inaccurate/uncertain model, a new congestion control algorithm. The utilized fluid flow model (FFM) is of low order and simpler than a detailed Markovian queuing probabilistic models. The proposed time-delayed dependent congestion control dynamics is studied analytically to guarantee stability of the closed-loop system. To evaluate robustness and to demonstrate the capabilities of our proposed algorithm, simulation results are provided for different operating conditions and time-delay values.