How to Measure Latency & Jitter on VoIP

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One of the most common reasons why users have problems with their VoIP service is poor Internet latency. Latency is measured as the amount of time required for a packet to reach its destination and then return to its source. When using VoIP with a high latency, you may experience voice delay, interruptions and overall poor audio quality. This problem is escalated even further if you are having an intermittent or jittery connection. If you experience these problems while using your VoIP service, you can check your latency values to determine if your Internet service is the cause.

  • Press the "Windows" and "R" keys simultaneously. This opens a Run box on the bottom of your screen.

  • Type "CMD" in the Run box and then click the "OK" button. This loads the Windows Command Prompt.

  • Type "Ping --n 50 www.google.com" and then press the "Enter" key. This command tells your computer to send 50 packets to Google and then measures them. Statistics will display when the ping finishes.

  • Look at "Ping statistics for..." at the bottom of the ping result. The first important piece of information is contained in the line "Packets." The "Sent" will be "50" and with an optimal connection, "Received" should be "50." If "Loss" is over 10 percent, contact your service provider.

  • Look at "Approximate round trip times in milli-seconds." Below that are the measurements of the ping. These are defined by "Minimum," "Maximum" and "Average." Depending on your location, these numbers will vary. Ideally, the "Average" should be around "150ms" or lower. Higher numbers will yield poorer service. To understand the consistency of your line, all of the values would be equal on a perfectly consistent connection. However, so long as the "Minimum" and "Maximum" are within "250ms" or less of each other, the line should be stable enough to support most VoIP codecs.

References

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