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Transmission of high quality video over the Internet faces many challenges including unpredictable packet loss characteristics of the current Internet and the heterogeneity of receivers in terms of their bandwidth and processing capabilities. To address these challenges, we propose an architecture in this paper that is based on the temporally scalable and error resilient video coding mode of the H.263+ codec. In this architecture, the video frames are transported over a new generation IP network that supports differentiated services (Diffserv). We also propose a novel two rate three color promotion-capable marker (trTCPCM) to be used at the edge of the Diffserv network. Our simulation study demonstrates that an average of 30 dB can be achieved in the case of highly congested links.