A Performance Evaluation of Voice Over IP Protocols (SIP and H.323) in Wireless Network

Abstract. Many types of Voice over Internet Protocol (VoIP) are used to provide audio or multimedia sessions over Internet Protocol (IP) networks, multimedia communications became very easy by using applications that provide Internet Protocol VoIP like Skype, Viber, WhatsApp, etc. And network simulation has frequently been used to determine the performance feasibility of any network protocols and the model reliability before practical implementation. Several kinds of studies were carried out on voice efficiency over different types of networks environment, among these experiments and researches, finding a better signaling protocol for communication by evaluating and analyzing the performance of the protocols, such as the most commonly used Session Initiation Protocol (SIP) and (H.323) signaling protocols. This paper provides a comparative study of the performance of the two aforementioned protocols that are most widely used over the IEEE 802.11a wireless network by using the QualNet simulator. The study was performed by analyzing the data packets for both initiator and receiver for both protocols, to evaluate the performance based on five metrics: Session total Bytes, Establishment time, Sent, total Bytes received of Real-time transport protocol(RTP), Average End to End Delay and Overall Throughput. The outcomes demonstrated SIP protocol ascendingly rise and superior over H.323 protocol as a permanently started from the Zero-point around 5.4 (Mbps) of the time until the end of the experiment close to 6.2 with a 0.05-second delay while the rival was always below these values of throughput. Hence its superior provides preferability in multimedia sessions. studying and evaluate the performance of two IPs with a high capability simulator QualNet, SIP outright outperforms H.323 provide preferability recommendations in voice calls.