Update: Not sure if I mentioned this before, but Gizmo now integrates with Google Voice. There is a new feature, called "Gizmo Voice," where you can send your outgoing calls directly through Google Voice. You don't get charged when you do this. I understand this is an experimental feature, and I was told that there may be occasional outages.

You can enable it by going to the Gizmo web interface and entering your Google Voice credentials under "Google Voice."

My main use case is with a landline phone connected to an analog telephone adapter. I've been making outgoing calls directly from this phone and it so far seems to integrate seamlessly. I am not getting charged for these calls.

I've also tested it using the GIzmo client. That works too- exactly like the ATA-connected phone.

Gizmo Voice does not seem to work from the N810's Internet Call client. When I make calls that way I get a computer voice telling me I need to purchase credit. Not sure what the problem is.