Abstract

The emergence of VoIP in the growing Internet services today has brought about new way in which services are rendered to the public. In viewofprovidingbetter alternative to Public Switch Telephone Network (PSTN) with high quality and efficient internet telephony (VoIP), there is a need of having an improved QoS in Voice transmitted over the Internet. In this work, the influence of different impairment factors on Voice over Internet Protocol (VoIP) as a contributory factor were analyzed, characterized, and evaluated. The results obtained from the research work compared with the theoretical values have some common correlations. This indicated that the impairment factors have significant contributory effect on voice transmitted over the internet.

References

• Xianhui Che et al. "VoIP Performance over different Interior Gateway protocols"; International Journal of Communication Networks and Information Security (IJCNIS) Vol. 1, No. 1, April 2009; Pg. 34.
• O. Adegbenro et al. "The Contributory Effect of Latency on the Quality of Voice Transmitted over the Internet", Proceedings of The 2011 International Conference on Modeling, Simulation and Visualization Methods" WORLDCOMP '11, July 18-21, 2011, Pg. 278 – 281.
• Bur Goode, Senior member IEEE; "Voice over Internet Protocol (VoIP)", Proceeding of the IEEE Vol. 90, No. 9, pp 1495-1497, Sept. 2002. , 189-207
• Zizhi Qiao et al. "A New Algorithm for Speech Quality Improvement in VoIP System" Wireless Peers Commun (2008), October, 2007.
• Shu Tao et al, "Improving VoIP Quality Through Path Switching" ; University of Pennsylvania KuaiXu, University of Minnesota Antonio Estepa, University of Sevilla. . . works. bepress. com/lixin_gao/75/; 2005.
• Alan Clark "Voice Quality Measurement: Understanding VoIP" CEO and President, 2005
• Alan Clark; "Telchemy IP Network Impairment Simulator" version 2. 1, 2003
• Telechemy, "Voice Quality Measurement", Application Note,March 2008.
• Kevin Davis, "Understanding Latency in Network Systems: Sources of Latency and Jitter in Network Architectures", White paper by Senior Consultant, NetQoS, 2008, www. netqos. com
• David Houck and GopalMeempat, "Call Admission Control and LoadBalancing for Voice over IP," Performance Evaluation 47, (2002) 243-253.
• KarieGonia –"Latency and Quality of Service for Voice over IP"; SANS Institute, version 2. 4bOption 1,2004.
• Henning et al. , The Session initiation protocol: Internet – Centric Signaling; IEEE Communications Magazine, October, 2000.
• Xipeng Xiao et al. , Internet QoS: A Big Picture"; IEEE Network, March/April, 1999. Pg 8 – 14,. QoS (Quality of Service); www. linktionary. com/q/qos. html
• Rajneesh Narula, Kaushal, "Performance Analysis and Evaluation of Hybrid Network using different Integrated Routing Protocols", International Journal Of Computers & Technology(IJCT), pg. 3090, Dec. , 2013.
• John Q. Walker et al. , "A Handbook for Successful VoIP Deployment: Network Testing, QoS, and More"; NetIQ Corporation; Mission Critical Software for e-business, 2001
• Overcoming Barriers to High-Quality Voice over IP Deployments; Dialogic White Paper, Sept. 2007.
• Jeffrey Rodman, VoIP to 20 KHz: Codec Choices for High Definition Voice Telephony"; POLYCOM White Paper, July 2008.
• LiotopoulosF. K. , Dagiuklas T. , V. Karypidou"Vorttex: Evaluation of the perceived VoIP QoS by a third-party, using the E-Model, 2007.
• John S. N. et al. , "Wide Area Network Efficiency Through Optimization of Key Performance Indices"; IEEE Conference, June, 2010.
• MiroslawNarbutt et al. ,"The Effect of Bandwidth on VoIP Performance in 802. 11b WLAN Networks", IEE Irish Signals and Systems Conference, Dublin, June 28-30, 2006.
• ITU-T Study Group 12, "The E-model, a computational model for use intransmission planning"; ITU-TRecommendation G. 107, March, 2005.
• Ganguly et al. , Performance Optimizations for deploying VoIP Services in Mesh Networks; IEEE Journal on Selected Areas in Communications, Vol. 24, N0. 11, Nov. 2006.
• S. Tao, K. Xuet al. , "Improving VoIP Quality Through Path Switching", in IEEE INFOCOM, 2005, pp. 2268–2278.
• "Voice over IP" (VoIP); SmartBits Performance Analysis System; Spirent Communications, 2001.