Comparative Study of Various VOIP Applications in 802.11a Wireless Network Scenario

Abstract: Today, Voice over Wireless Local Area Network (VOWLAN) is the most accepted Internet application. There are a large number of literatures regarding the performance of various WLAN networks. Most of them focus on simulations and modeling, but there are also some experiments with real networks. This paper explains the comparison of performance of two different VOIP (Voice over Internet Protocol) applications over the same IEEE 802.11a wireless network. Radio link standard 802.11a have maximum transmission rate of 54Mbps. First protocol is session initiation protocol (SIP) and second is H.323 protocol. First one has an agent called SIP proxy. Second have a gateway reflects the characteristics of a Switched Circuit Network (SCN). With this comparison we have required to obtain a better understanding of wireless network suitability for voice communication in IP network.