Generally people accept that using Voice over IP (VOIP) services will have a high level of quality, especially if they’re connecting from a hardwired internet connection.  We can measure the quality of your VOIP network. We can measure VOIP quality by its MOS or Mass Opinion Score. It is calculated by using the International Telecommunications Union (ITU) standards P.861 and P.862 or using ITU Standard G.107. Another way to determine the quality of your VOIP phone is to look at its R-Factor.  This score is an alternative to the MOS and runs on a scale that ranges from 0 to 120.  There are other factors that can be studied to determine the quality of your VOIP system.  They are: delay, jitter and lost data. Read more at: http://it.toolbox.com/blogs/tech-advances-business/how-to-assess-voice-quality-on-a-voip-network-70043