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It may differ, but I when I have a WiFi connection, I use a VoIP app with my smartphone to avoid using up my voice minutes, and as long as I have around 2Mbps it works pretty well. Come to think of it, that's download speed, it still works ok if the upload speed is slower than that, at around 1Mbps. If I get less than that, people complain that my voice starts breaking up or there is lag. I'm not sure about other VoIP systems, but with what I use, you can change things like buffer settings and mic gain to balance voice quality with lag. It took me a while to find the proper balance, but now it seems to be as good as just using my cell phone as far as voice call quality is concerned.
Just as important as speed is latency. If there is a lot of latency, there is going to be lag. Nothing can be done about that. I find VoIP over 3G to be pretty much unusable, but I'm on Sprint, which is the slowest of the major providers.