E2E audio MOS

Discover the unique end-to-end solution in the market

While smartphones these days can do a plethora of things one of their primary functions is to make calls. Even though the number of voice calls may have slightly reduced, the consumers are more demanding that when they have to make voice calls, they expect stellar audio quality.

It is not surprising that according to a consumer survey by Deloitte the number one reason in US why end users are leaving a mobile network is the voice quality. Voice quality remains an important factor for end users and many media review companies and Mobile Network Operators are now heavily including it in their testing scope.

PC magazine pointed out in 2018 that mobile data seems to improve by leaps and bounds every year, but phone audio quality seems to have stood still for years. There are many reasons for this, mainly new technology roll outs and poor interoperability between Network operators.

At SmartViser we have noticed an increased number of requests from our OEMs and MNOs customers alike to include voice quality MOS in the list of KPIs currently supported by viser™. Placing our customers at the heart of innovation our R&D have developed the first version of audio MOS scoring based on POLQA™* industry standard which was launched in 2019 with a great feedback. This year at Mobile Word Congress in Barcelona we will be unveiling the revised version with an easy set up and deployment that allows to measure the Audio MOS in the following states:

  • Audio Uplink

  • Audio Downlink

  • End To End

  • Scalable for Lab, Field testing and large-scale deployments

The Mean Opinion Score, or MOS as it is now widely known assesses the quality of voice of calls using a scale of 1-5 (5 being the highest quality) based on  the scientific algorithm POLQA ™. 

The Audio Quality can be tested or monitored whatever the technology (2G-3G-4G-5G, VoIP: VoLTE - VoWifi, or even mixed …). It offers great opportunities for OEMs/ODs to fully test their device and ensure it decodes correctly and with the highest quality voice calls in any network infrastructure.


On the other hand, it allows Mobile Network Operators to test the Core Network functions before an update or a release and to monitor on a regular basis ensuring they offer the level of QoE their subscribers are expecting.