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This article proposes an architecture that adapts multimedia flows to the context of the participants in communication in peer-to-peer systems. This architecture allows a pair to play several roles (pair adaptation, Proxy or communicating), the adaptation peer researches adapters, compose them, if it is necessary to have interfaces to adapt, to realize the complex adaptation operations and send them to peer communicating. The peer Proxy supports the execution of the interface if the communicating peers are not able to execute it. This architecture allows recomposing dynamically the adaptive interfaces, so; this facilitates changes in the user's environment and in the adapters. The construction of the interfaces adaptation is dynamic; it applies the Choquet integral on a set of coefficients in order to have a compatible interface to the needs of the communicating. A complete chain of adaptation is implemented using the Java language for creating interface adaptations, the Web service for description and communication profiles such as RDF and HTTP.