Improvement of VOIP Quality of Service Using Route Queue Management

Voice over IP (VOIP) is becoming popular over IP network. However, the VOIP performance would become unsatisfactory particularly when the link is congested. This paper describes a method of improving the quality of service (QoS) of VOIP with low complexity by intensively studying the effects of random early detection (RED) on VOIP. It is found that RED is able to reduce the delay distribution, jitter, effective loss and consecutive loss of VOIP traffic, thus the quality of service of VOIP is improved. In addition, the application of RED algorithm to VOIP could control the traffic congestion to a certain extent.