A Novel Framework for Proxy Topology Building and Proxy-Level Routing in a Peer to Peer SIP Architecture

Research activities have recently begun on the integration of peer to peer (P2P) principles to the session initiation protocol (SIP). We have contributed to these activities by proposing a P2P SIP architecture wherein the SIP location service is integrated in proxies that are peer entities in the P2P overlay. Introducing proxies in a P2P SIP overlay raises two important issues: proxy topology building and proxy-level routing. Thanks to proxy topology building, a proxy entering the overlay knows where it should insert itself in the network of proxies. Proxy-level routing enables messages to be routed in the network built by proxy topology building. This paper proposes a novel framework for proxy topology building and proxy-level routing for our proposed architecture. The framework is P2P infrastructure independent and general enough to be used by any P2P SIP architecture that meets a minimal set of requirements. It is made with an algorithm that builds the network of proxies in a ring, and a novel routing algorithm that outperforms existing routing algorithms such as OSPF (that could have been used on the ring topology). The novel algorithms are described and their performance evaluated via simulations.