A related question -- when people talk about VOIP here, I think they mostly mean a telephone that hooks up to your internet connection and dials out for cheap.

Do any companies offer what I have been looking for when I mean VOIP -- a phone system where I can have one phone extension sitting at home in the US, and another phone extension overseas, hooked up where my parents are (and moves with them wherever they're traveling) ? So I can always dial them with a simple 7 digit number for example? Or even 1 digit... And talking to them for free, basically?

Do any of you know of such a solution available at the consumer level? I guess this is sort of enterprise level technology which probably involves dedicated servers, but I think there must be something like it for consumers.

Thanks!