期刊名称：International Journal of Advanced Research In Computer Science and Software Engineering
印刷版ISSN：2277-6451
电子版ISSN：2277-128X
出版年度：2012
卷号：2
期号：9
出版社：S.S. Mishra
摘要：Security and privacy become mandatory requirements for VoIP communications that needs security services such as confidentiality, integrity, authentication, non -replay and non repudiation. The available solutions are generic and do not respect voice specificities and constraints. Thus, Quality of Service (QOS) of the voice is affected by delay, jitter, and packet loss. New security solutions must take into account the real-time constraint of voice service and their mechanisms should address possible attacks and overhead associated with it. Nowadays IPSEC VPNs (Virtual Private Networks) is considered the strongest security solutions for communications over IP networks. In this paper, analysis and experimental results for an evaluation of the (QOS) of voice traffic are presented. A certain metrics like Packet Delay Variation, MOS (Mean Opinion Score), Packet End to End Delay, Traffic Received, Traffic Sent, are obtained and analysed. These results are further observed to study the effect of IPSEC VPN on these performance metrics. Experimental results confirm that, depending on the type of the traffic, the overall security of the networks is improved, with a reasonable decrease in term of performance
