Welcome to our VoIP quality testing page. To use the tester (powered by Brix Networks), you must have Java installed and enabled. If you are experiencing difficulties, please read our troubleshooting section below.

Test Information

To test your VoIP connection from the UK select the London destination. Please allow around 30 seconds for the test to complete. By selecting any of the call locations below, you agree to these Terms of Use. Results are only an indication of your connection quality to run voice.

Troubleshooting

We recommend you use the official Sun Java 2 Runtime Environment (J2RE), available for Windows, Linux, Macintosh, Solaris and other operating systems. The test should run in the next page. If nothing appears, you may not have a Java Virtual Machine installed or correctly configured.

If you receive the message "A connection error occurred while testing. Please try again later.", you may be running a firewall or a network configuration which is preventing the tester from connecting. If your Internet access is restricted via a web proxy server only, you will not be able to run this test.

In order for our quality test to work, please ensure than TCP ports 8080 and 8081 are not blocked on your computer or firewall.

Rough Quality Guide

NOTE: Voice quality was traditionally reported as a Mean Opinion Score (MOS) on a scale from 1-5 where 1 is the lowest and 5 the highest. In the past, this was measured by getting people to listen to test phone calls and rank the quality of those calls. Here we are using a software model to calculate the MOS that we report to you, based on an international telephony standard called the E-Model or the ITU-T G.107 standard. While the theoretical MOS scale reaches 5.0, practically you won't get a 5.0 no matter how good your network connection is. That's because VoIP codecs introduce some amount of quality loss. For example, the maximum MOS score you can achieve with the quality-preserving G.711 codec is 4.4. For the low-bandwidth G.729 codec, the maximum is only 4.2. The figure on the right shows the MOS values and the likely opinions of users.