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How to use MOS Score to troubleshoot Voice Over WiFi

The quantitative assessment of the quality of Voice Over WiFi communications is often measured by its MOS score (Mean Opinion Score). The MOS score ranks the quality based on a number in the range of 1 to 5. The original idea behind the MOS score was to take the mean average of all the individuals rating the quality of a test call. That soon changed, as modern network analyzers can calculate MOS score using artificial software algorithms.

The MOS score is highly subjective and should not be used as the deciding factor in a Voice Over WiFi system deployment. Other measures should also be taken into consideration such as packet loss, jitter, latency, etc.

MOS ScoreUser Experience
4.3 – 5.0Excellent
4.0 – 4.3Good
3.6 – 4.0Fair
3.1 – 3.6Poor
2.6 – 3.1Bad

A wireless network analyzer such as AirMagnet Survey and AirMagnet WiFi Analyzer PRO can be used to collect the MOS score, packet loss, latency and jitter measurements.

Author Bio –
Product Manager – Wireless

Julio Petrovitch is a product manager at NetAlly, plus a certified CWNA/CWAP/CWDP/CWSP. He’s worked with network design, testing and validation for more than 15 years. Throughout he’s career he has had the opportunity to work with multiple networking technologies, including POTS, DSL, Copper/Fiber Ethernet, Wi-Fi, Bluetooth, and BLE.