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Home > Success Center > VoIP & Network Quality Manager (VNQM) > VNQM Documentation > VNQM 4.5 Administrator Guide > Quality of Service metrics > Mean Opinion Score (MOS)

Mean Opinion Score (MOS)

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MOS is an industry standard measure of call quality expressed on a scale of increasing perceived quality, from one to five. SolarWinds VoIP and Network Quality Manager reports MOS as computed by a standard International Telecommunications Union (ITU) algorithm involving the codec for your VoIP network and values of latency, jitter, packet loss, and MOS advantage factor. Jitter, latency, and packet loss are variable quantities that are measured by SolarWinds VoIP and Network Quality Manager in real time. Generally, MOS reflects call quality as shown in the following table.

Call quality


Very satisfied




Some users satisfied


Many users dissatisfied


Nearly all users dissatisfied


Not recommended


Both the MOS advantage factor and the codec algorithm are selected for your specific network on the SolarWinds VoIP and Network Quality Manager Settings page. The following table provides guidance for how the advantage factor is determined for your application.

Communication System Type examples

Maximum Advantage Factor value

Conventional wired network


Wireless network within a building


Outdoor wireless network (cellular phones)


Remote communications by satellite


For more information about MOS calculations, see the ITU-T Recommendation G.107.

For more information about codec algorithms, see Jitter.

For more information about SolarWinds VoIP and Network Quality Manager settings, see Configuring VNQM settings.

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