Study on QoS Protection Mechanism of VoIP Systems

This paper describes the principles of QoS communications, analysis the requirements of how voip to provide QoS guarantees, clarify the major problems it´s facing now. And proposes the solution to the problem of latency, jitter, packet loss and echo effects, with the same time introduces several of the QoS model that can improve the qos of voip, discusses their respective advantages and shortcomings, ultimately concludes that no single technology and models can effectively solve the QOS issues of the VoIP system, application of an integrated QoS solution is the only effectively way to solve this problem.