I personally haven't been able to get Gizmo functioning with Google Voice as described by Jason W at the beginning of this thread. Their service is intermittent at best and Gizmo will only ring 1 out of 10 calls from Google Voice, so I'm definitely stuck using Skype. I thought it might have something to do with that particular peering, so I purchased some call-out credit and the result is the same. Users on the other end can't even hear me talk when it did successfully connect. I also initiated a call from another SIP provider inbound to my Gizmo account and nada. I guess my Dad was right - there really is no such thing as a FREE lunch!