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. We have presented in a new technique VNSIP (Virtual Network for Session Initiation Protocol) to fix the problem related to constraints of SIP deployment in MANET (Mobile Ad Hoc Networks). In this paper we use a new algorithm which we have called MCAC (MANET Call Admission Control) to improve VNSIP Performances. | International Journal of Computer Networks and Communications Security C VOL. 1, NO. 3, AUGUST 2013, 68–74 Available online at: ISSN 2308-9830 N C S Performance Enhancement of VNSIP approach, using MCAC algorithm I. MOURTAJI1, M. BOUHORMA2, M. BENAHMED3, A. BOUHDIR4 1234 LIST laboratory, FST of Tangier 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. We have presented in a new technique VNSIP (Virtual Network for Session Initiation Protocol) to fix the problem related to constraints of SIP deployment in MANET (Mobile Ad Hoc Networks). In this paper we use a new algorithm which we have called MCAC (MANET Call Admission Control) to improve VNSIP Performances. Keywords: Ad hoc, SIP, MCAC, Evaluation of performance. 1 INTRODUCTION VNSIP [13] allows decentralization of SIP proxies, specially registrar, proxy and location servers [1, 2, 10], by integrating those server functionalities in each MANET node. VNSIP node contains a supervisor module VNA (Virtual Network Algorithm), it is responsible of activating and deactivating server functionalities according to the position of the node in the MANET [3][7]. To achieve evaluation of performances of VNSIP, we have compared our solution to the TCA approach [9], which is consider as a solution giving a very interesting result to fix the problem of SIP adaptation to Ad Hoc Networks. Simulations of both approaches has shown that our solution guarantees better results than TCA in terms of setting .
