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In this paper we address the problem of image transmission over unreliable networks. The system is based on multiple description coding, that introducing redundancy in the produced stream is able to guarantee a useful quality reconstruction also in presence of high percentage of packet losses. The target of this work is providing a flexible redundancy insertion in order to make the system robust for any packet loss situation over different networks (the Internet or mobile). The simulation results show the capability of the system to achieve the optimal image quality reconstruction according to network behavior.