[VoiceOps] PESQ test results

Richard Jobson richard at teraquant.com
Wed Mar 1 18:40:28 EST 2017

Wow, what a great question ! J


May I try to understand your circumstances a bit more?


1.       Are you measuring only narrowband calls e.g. G.729 or g.711 codecs (or even circuit switched only calls) – wideband calls (>3.5kHz) we should ensure the POLQA scale is being used

2.       Are you seeing PESQ range:  4.1 to 4.35 in the ABSENCE of packet loss or significant jitter? – if you have say >10-15% packet loss or more, you would expect “MOS” (however, it is measured) to drop way below 4.1

3.       If POLQA is relevant, we need to determine whether narrowband or wideband POLQA scale.

4.       What interfaces are you testing from, analog or digital (i.e. [SIP or H.323] VoIP endpoint ). Testing from analog interfaces into phone devices thru h/set is susceptible to inaccuracy 

5.       PESQ & POLQA values can range significantly more than this depending on the network, (wireline [fiber v Cu] v wireless for example), the devices used and whether the network path involved transcoding


This would put it in some context





From: VoiceOps <voiceops-bounces at voiceops.org> on behalf of Colin Brown <zavoid at gmail.com>
Date: Wednesday, March 1, 2017 at 8:56 AM
To: "voiceops at voiceops.org" <voiceops at voiceops.org>
Subject: [VoiceOps] PESQ test results


Hey All,

For those of you doing pro-active PESQ score testing in the US.  How much fluctuation do you normally see our expect on your results?  4.1 to 4.35  for example.  That seems like a large swing to me... Was looking for opinions from others on or off list.






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