ONLINE VOIP TESTER!

[JamesLovett]

Dear All,

Found this on the web and it is brilliant!

Test your internet connection for VoIP use and what MOS you will experience. Bear in mind that depending on the CODEC your VoIP provider uses (G711/G729...) there will be different bandwidths needed. DEVIL7 solutions utilise the quality-ensuring G711 codec only, which needs 80Kilobits per second per concurrent call.

www.testyourvoip.com

What is MOS?

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. Back in the old days, companies would recruit people to listen to test phone calls and rank the quality of those calls — great job, huh? They would then take the average (specifically the mean) opinion of all the listeners and assign that as the call's quality.

Naturally, it's tough to get a bunch of people to sit around and listen to phone calls all day, so here at TestYourVoIP.com we use a software model to calculate the MOS that we report to you. Our software model is based on an international telephony standard called the E-Model — the ITU-T G.107 standard to be exact.

While the theoretical MOS scale tops out at 5.0, practically speaking, you won't get a 5.0 score 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.

Brought to you by DEVIL7 Ltd...