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This work proposes a session model for cross-domain interactive multi-user IPTV. The model has been designed to support the creation and consumption of multi-user multimedia sessions that span multiple technology domains like managed IPTV, mobile network, home network and the Internet. These sessions can combine content and services from various domains and the model enables shared experiences between users at different locations, connected across diverse technology domains. This paper describes the session model, gives an overview of the general architecture and presents the results of an implementation that spans home, Internet and mobile networks. This session model has been and first application demonstrators have been realized.