The predominant candidate for current trend of multimedia services convergence with mobile/fixed networks and broadcast-interactive applications is the IP Multimedia Subsystem (IMS). IMS entails novel business opportunities for pioneering and emerging multimedia services, such as IPTV and VoIP video call applications. However, this strong commercial interest on this promising convergent IMS environment is balanced by the lack of efficient user/customer-centric network management mechanisms. ADAMANTIUM proposes an IMS-compatible Multimedia Content Management System (MCMS) focused on performing dynamic cross layer adaptations for optimization of the user experience in terms of perceptual quality for IPTV and VoIP services. This multimodal management system will be applied in an integrated and coherent way along all the network layers and delivery-chain nodes based on a user/customer-centric approach rather than a typical engineering one. Towards this, the proposed management system will make use of advanced IMS-compatible PQoS and NQoS monitoring and adaptation mechanisms across the network delivery-chain, enhancing in this way the current IMS management functions by providing perceptual awareness to them. ADAMANTIUM MCMS will be implemented and demonstrated on an actual IMS platform installed over a UMTS access network, where VoIP-based and IPTV applications over IMS services will be provided.