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Mahbubur. R. Syed

Work place: Minnesota State University/Department of Computer Information Science, Mankato, MN, U.S.A

E-mail: mahbubur.syed@mnsu.edu

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Research Interests: Computer systems and computational processes, Systems Architecture, Multimedia Information System, Distance education, E-learning, E-learning experience management

Biography

Mahbubur. R. Syed is currently a professor of Computer Information Science Department at Minnesota State University, Mankato (MSU), USA. He has more than 30 years of experience in teaching, in industry, in research and in academic leadership. He has more than 30 years of experience in teaching, in industry, in research and in academic leadership. Earlier he worked at the North Dakota State University in USA, Monash University in Australia, Bangladesh University of Engineering and Technology (BUET) in Bangladesh and in Hungary. He was a founding member of the Department of Computer Science and Engineering at BUET and served as Head of this Department during 1986-92. He received the UNESCO/ROSTSCA' 85 award for South and Central Asia region in the field of Informatics and Computer Applications in Scientific Research. He has co-edited several books in the area of e-commerce, software agents, distance education, multimedia systems and networking.

Author Articles
Performance Analysis of VOIP over GRE Tunnel

By Aria. Asadi Eskandar Mahbubur. R. Syed Bahareh. Zarei.M

DOI: https://doi.org/10.5815/ijcnis.2015.12.01, Pub. Date: 8 Nov. 2015

Voice over IP (VoIP) is commonly known as phone service over the Internet. Any service using public IP network requires certain extent of security. Demand for security in VOIP technology is increasing. VPN is one of the commonly used methods to secure VOIP traffic. In this paper we simulated behavior of a VOIP communication while running over a GRE VPN Tunnel using OPNET Modeler 17.5. During the simulation, such performance parameters as: choice of voice signaling protocol, voice Codec, parameters arising from network QoS (in this study, homogenous vs. heterogeneous network environment) and type of VPN tunneling protocol, were examined. We evaluated performance of VOIP communications in homogenous and heterogeneous network environments, configured based on two different signaling protocols, namely H.323 and SIP. Also, G.711 and G.723 were configured and tested as the choice for voice Codecs. GRE was implemented as the tunneling protocol. Result analysis of this study indicated that GRE Tunnel didn’t show a significant increase in such call quality of service (QoS) performance factors as: end-to-end delay, call setup time, or a decrease in call MOS value. Even though in a non-ideal (heterogeneous) network environment, call quality of service (QoS) performance factors shoed poor results; however, there was no significant evidence to suggest that GRE Tunnel is the root cause for such poor results.

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