Should I be able to call out through Dial Central if I have a Google Voice number but no Gizmo account?

I have my GV account set up to forward to my cell phone.

If I enter a number on the N810 Dial Central dialpad and press "Dial," it rings my cell phone, then connects it with the number I dialed.

I'm trying to figure out if there is a way to dial out directly from the N810. If so, how do I configure it?

Thanks.