A New Technique for Adapting SIP Protocol to Ad Hoc Networks: VNSIP (Virtual Network for SIP) Illustration and Evaluation of Performance

Ad Hoc Networks provide a real opportunity to design flexible networks, very simple to deploy. However they remain a particular computation environment, characterized by the deficiency of pre-existed and centralized infrastructure. In the other hand, SIP protocol, which knows a huge booming in internet networks, requires centralized entities, like proxy server, registrar server and location service; consequently SIP is not adapted to Ad Hoc networks. In this paper, we present and evaluate a new technique, which we have called Virtual Network for SIP (VNSIP) to fix the problem related to the constraints of SIP deployment in Ad Hoc network. The main idea of this technique is to create a virtual infrastructure, enabling SIP to proceed in a distributed architecture inside the Ad hoc Network.