Regionally, the PSTN(POTS) was faster to connect for calls placed to North America (4.3 seconds vs. 5.7 for VoIP), while international calls connected faster with VoIP (8.7 vs. 10.4 seconds for PSTN).

A recent Internet Phone quality study by Brix Networks indicated that 1 in 5 calls were classified as unacceptable, and that call quality was steadily declining. As this study may have created the impression that VoIP service is not capable of delivering PSTN-grade phone service, Minacom felt it should be clarified for both those in the VoIP industry, and individuals and enterprises considering VoIP service, that this report evaluated computer-to-computer (PC-PC) Internet phone service, similar to those offered by Skype, Google Talk, MSN and Yahoo Messenger. The quality and service reliability of these applications does not compare to that of the VoIP phone services offered by telcos, cable operators, and broadband VoIP providers who carefully deploy, monitor and manage the quality of their services.

said by Karl Bode :

Good point. I also added notation that Minacom builds gear for those same providers.

said by Dezbend :

...it went on to state that 11 customers per hour come back from VoIP(they forgot to mention how many are leaving per hour).

said by Karl Bode :

I've noticed my friends oddly migrating back to copper of late. Granted one was on Sunrocket....