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A network based method for an intelligent distribution of transport resources of heterogeneous points of attachment to the network among mobile nodes with multiple network interfaces is presented in this paper. Selection of the used network for a particular multimedia session is based on the QoS situation in access networks available for mobile nodes. A possible realisation using IP multimedia subsystem on the signalling plane is described. The proposed idea is based on the fixed & mobile converged network architecture with Ethernet based data transmission developed in the ScaleNet* project. The performance of the presented mechanism has been evaluated by computer simulation.