I've seen that in North America for years and I don't think it implies VOIP at all ... calls from the U.S. sometimes show local number for caller ID when they ring through to my phone, and I always assumed (yeah, I know ...) that all it meant was that the long distance link terminated locally (and, I would guess, without the correct caller ID) at some local access point that had its own caller ID designation. I understand why a VOIP link might do that, but I don't see why _only_ VOIP would do that.
Geoffrey Welsh Ambidextrous? No, I said I'm ambinonscattous - I don't give a crap either way!