Google Voice is apparently a call redirection service rather than “true” VoIP. It uses phone lines to send analog voice signals, rather than IP packets, from one point to the next. This is a bit disappointing to VoIP zealots but welcome to the rest of us, who should get better call quality as a result. However, we’re still awaiting a detailed explanation of just how Google Voice works – and waiting for it to be available beyond the GrandCentral community and a few reviewers, as well! Ref: GV Numbers