This paper presents a flexible peer-to-peer-based middleware for future user-centric mobile telecommunication services, which supports key functionalities needed to address personalization, adaptation and coordination of services running on top of it. The underlying communication pattern is based on dynamic negotiation that enables interworking of autonomous decentralized entities in a rapidly changing and open environment. This paper focuses on the middleware's support for context-aware

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... ion of a multimedia service for mobile users. Service adaptation takes into account both user preferences and contextual changes to modify the service behavior and contents. The middleware implementation is based on JXTA extended by a mobile agent platform and is deployable on a range of mobile devices including mobile phones and PDAs.