This is the most streamlined method that I know of so far for both making & receiving calls on the iPad using your Google Voice number. Most the other methods require you to dial out using a 2nd device or computer, but not this one. It will ring even if your iPad is asleep & the app is closed. Forward your Google Voice number to your Gizmo5 SIP number in your GV account settings online, then use the iSip app setup wizard to choose the Gizmo5 setting, input your Gizmo5 username/password, enable APNS in the account manager & input your Gizmo5 number in the Phone Number field under the Advanced Settings, save it all then set the account to On. Should be good to go then.