What is Mean Opinion Score (MOS)?


In voice telephony the term MOS, or mean opinion score, is a measurement of the quality of human speech at the destination end of the circuit. MOS is a calculation based on performance of the IP network over which it is carried, expressed as a single number in the range of 1 (lowest perceived quality) to 5 (highest perceived quality). In this calculation MOS is a function of CODEC, Latency, Jitter, and Packet Loss. Masergy’s UCaaS Analyst provides MOS for every call that is completed between two end points.

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