What Is QoS VoIP?

Internet telephony.

"Quality of Service" (QoS) for "VoIP" (Voice over Internet Protocol) is a concept with no set guidelines. However, there are generally defined aspects of the service which affect quality.

Latency

This is the speed of transmission--the time taken, measured in milliseconds (ms) for a packet to travel over the network from your computer to its destination and back. For a For a VoIP connection, you will need a round trip time of less than 150ms.

Jitter

Communication software needs to expect incoming data packets to arrive at a regular rate. Irregularity in the transmission speed of packets over the Internet is called jitter. VoIP QoS is impaired by a Jitter of more than 2ms.

Packet Loss

Lost data has to be resent, and so any packet loss is going to slow down the performance of applications relying on the Internet. For Quality of Service on VoIP, this should be zero. A loss rate of more than 0.5 percent will damage quality.

Throughput

VoIP service providers have bandwidth testers on their websites. Potential customers can test the available bandwidth of their connection before signing up. This is the throughput. For good quality reception, you will need an upload speed of about 90 Kbps for each line you want to run.

References

• VoIP-info.org: QoS
• Tip and Trick: Understanding Internet Line Quality Components: Ping, Packet Loss and Jitter

Resources

• Vonage Internet Speed Test