VoIP Quality of Experience

Ensuring Your Network Supports Optimal VoIP Performance
By NetQoS

Published August 2007, Posted August 2007

Abstract:

More than any other type of application, Voice over IP (VoIP) requires optimal network performance to deliver an acceptable quality of experience for users. There are many reasons why VoIP is so demanding. Unlike most data applications, VoIP is sensitive to latency, jitter, and packet loss. The maximum allowable latency of 150 milliseconds is quickly consumed by codecs, serialization delays, router queuing, and by transmission delay between locations. Firewalls and network address translation add latency to the processing of each packet. Network elements induce jitter by temporarily storing packets in buffers and queues. Congestion or the misconfiguration of Quality of Service (QoS) policies may result in bursts of packet loss. In short, VoIP is the most demanding application in your portfolio requiring optimal network performance, and the highest possible quality of service levels to deliver an acceptable quality of experience. As such, VoIP and its related applications can present a considerable challenge for those charged with managing the performance of business-critical data applications running on your converged enterprise network.

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