Recent Mean Opinion Scores of VoIP traffic by Minacom show that VoIP audio quality pretty much works. Quality isn't uniformly high, because of the unmanaged nature of access bandwidth and the general state of networks some places in the world. But it works well enough to be useful. This obviously raises a question. At some point, when the technology underpinning voice is nearly 100 percent IP, there may yet be ways to differentiate services based on levels of assured audio quality.
Managed networks probably still will be able to provide higher MOS scores on a consistent basis, compared to unmanaged networks, even though performance on unmanaged networks also will improve.
Of course, the other quality metrics should be capable of differentiation as well. Session integrity is the other current example of varying quality. Even when a VoIP call "sounds good," the integrity of the session might not be as good as a PSTN call. Voice VPNs will help, of course. So the issue is the degree to which unmanaged connections can be made more reliable by addition of VPN capabilities.
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