Extending sip to enable a more efficient multimedia session control in future networks

Nowadays, users are reachable through a number of telecommunication devices, network operators, as well as services and applications. The calling users if provided with the appropriate information can manually select the most suitable way of communication. Although this capability already affects existing business models, the lack of a transparent and a dynamic solution renders it hard to use. To tackle this issue we suggest minor extensions in the SIP protocol as well as the use of middleware to allow calling users to dynamically select the best way to route their requests towards called users. These extensions are described in detail while execution examples are also provided.