Mobile users are increasingly demanding multimedia content created specifically or at least tailored to cater for their needs and preferences. The limitations of current Internet challenge a lot the design of such sessions, and require embedding innovations beyond standards to achieve rich networking. In this scope, the Context Casting (C-CAST) project designed a context-sensitive network architecture to support value-added multimedia sessions with Quality of Service (QoS) guaranteed towards multiple users simultaneously, and in their wireless technologies. However, the per-flow driven signalling approach of Legacy C-CAST exponentially increases with the number of flow admissions, which jeopardize the system performance. Thus, this paper proposes the Advanced C-CAST, which re-architects the Legacy C-CAST to support context-driven over-provisioning of per-class bandwidth and overlay trees. The evaluation of Advanced C-CAST demonstrated its benefits against Legacy C-CAST by significantly optimizing overall signalling load and latency experience.