A novel idea is proposed to provide context-aware adaptive services by use of widely adopted Session Initiation Protocol (SIP) in NGN. As the key to the idea, a new context-aware SIP proxy is worked out. It will support environment adaptability through policy decision and exchange of context information using SIP and its sibling protocols. In this new proxy, we propose to deliver context according to specific environment characteristics. Network context sensing and control is another contribution in our work. This solution helps us to control QOS and realize network and service adaptation practically. Realization of context-aware adaptation within SIP-based sessions is explained with two application scenarios.
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