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. | International Journal of Computer Networks and Communications Security C VOL. 1, NO. 1, JUNE 2013, 23–29 Available online at: ISSN 2308-9830 N C S A New Technique for Adapting SIP Protocol to Ad Hoc Networks: VNSIP (Virtual Network for SIP) Illustration and Evaluation of Performance I. Mourtaji1, M. Bouhorma2, M. Benahmed3, A. Bouhdir4 1234 LIST laboratory, FST of Tangier, Morroco E-mail: 1imourtaji@, 2bouhorma@, , 4 ABSTRACT 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. Keywords: Ad hoc, SIP, Evaluation of performance 1 INTRODUCTION Using this technique, we will be able to design a virtual sub-network, which will be used by SIP [1, 2, 10] in a high mobility Ad Hoc network. VNSIP allows decentralization of SIP proxies, specially registrar, proxy and location servers, by integrating those server functionalities in each MANET node. VNSIP node contains a supervisor module which we called Virtual Network Algorithm (VNA), and which is responsible of activating and deactivating server functionalities depending on the position of the node in the MANET [3]. This paper is organized as follows. In the first section we’ll introduce VNSIP solution. In
