What is MOS?
Mean opinion score or MOS is type of measurement that is utilized in various forms of voice communications. The main purpose of MOS is to evaluate the quality of human speech at the point of termination on any type of phone connection. MOS is considered to be especially helpful with accurately accessing the voice quality that is achieved through Internet telephony, but is also employed to evaluate the sound quality on bridging equipment that is hosting an audio conference call. The structure for MOS is relatively straightforward. A simple sliding scale is utilized to measure the overall quality of sound reception within a given telephony environment. The scale is somewhat subjective, in that a selected group of listeners will simultaneously hear a reader recite a series of test sentences. Generally, the sentences are presented by a male voice, then repeated using a female voice. Some systems make use of computer generated voices for the recitation of the test sentences, but it is not u
The MOS, or Mean Opinion Score, is a numeric measure used for VoIP, indicating the sound quality at the receiving end of a communication circuit. Although the score is subjective it provides a widely-used method to rate the quality of voice communication in a simple way that meaningful to end users. The score is normally between 1 and 5 with 5 being the best. MyVoIP tests the line quality and measures the highest MOS that a connection can achieve – this is independent of the Codec selected for the VoIP test. The MOS value is reported in the MyVoIP summary tab once a connection test completes, a VoIP simulation that drops below 3.5 is considered poor quality, a measure of 4.2-4.5 is considered good quality.
