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In this paper robust control techniques are used and investigated for congestion control problem of time-delayed scalable differentiated Services (DiffServ) networks. The robustness capabilities of sliding mode variable structure control (SM-VSC) technique are utilized as a design basis for a new congestion control strategy subject to inaccurate/uncertain network model. The fluid flow model (FFM) adopted in this paper 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 the capabilities of our proposed robust control strategy, simulation results are provided for different operating conditions and time-delay values.