Over on the VoIP Central blog, they talked about a new study from Keynote Systems that says that users rate VoIP quality as being better than traditional landlines. Note that this is perceived quality, measured by means of the mean opinion score (MOS), where individuals give their own subjective judgement of the quality, and then this is worked out into a number representing the mean of the score of all those polled.

I can't say that I'm particularly surprised by this, since VoIP systems can use wideband codecs that have better frequency range, and so distort less on plosives and sibilants, as well as giving a much more natural range of frequencies to listen to. Systems (like Skype) that use the Internet for the backbone network still suffer from drop-outs and varying levels of throughput, which means varying levels of quality and therefore satisfaction. However, cellphones also give variable quality, and we have all had to get used to that. Perhaps the conditioning we have from 20 years use of mobile phones is actually contributing to the acceptance of VoIP?