Evaluating the Impact of Queuing Algorithms and Routing Protocols on QoS for VoIP Traffic over IP Networks

Abstract

As internet usage and digital applications continue to surge, ensuring high-speed connectivity with dependable Quality of Service (QoS) for multimedia communications—particularly VOIP—has become increasingly vital. To meet this demand, various traffic management systems have been explored. This study conducts an in-depth analysis of widely adopted queuing methods (FIFO, Priority Queuing, and Weighted Fair Queuing) in conjunction with routing protocols (RIP, EIGRP, and OSPF), assessing their impact on QoS for VOIP traffic over IPv4 networks. Through comprehensive simulation experiments using Opnet 14.5A, the research evaluates each combination under varying traffic loads and network scales. Key QoS indicators such as jitter, packet loss, end-to-end delay, packet delay variation, and traffic throughput were measured. The objective is to determine which routing protocol most effectively complements each queuing strategy in optimizing QoS, and to identify the most robust pairings of routing and queuing approaches for enhanced VOIP performance in TCP/IP networks