I'm pretty sure you posted a comment in an old Vonage topic as well, to which I responded.

The other bit of info that I didn't provide is the cost - it's ~US$31/month. There are a couple of int'l calling plans, but as I recall it was Europe and Australia that had the incredibly inexpensive rates.

It would be worth checking the website for Vonage, though. We've had it for nearly two years and who knows what may have changed since then.