Update: That was fast. Google has Google Voice doesn't currently support VoIP calls. The service, which assigns you a free Google number that you can connect with all your active phone lines to have one universal number, finally opened its doors stateside back in June and there has been some speculation that it would eventually be merged with a VoIP client of some sort. It's unclear if this is a first step in that direction or if the integration will be limited to Gmail -- if at all. A spokesperson for Google said that the company is always testing new products and services, and that it had "nothing specific to announce right now."