So, about not being able to use a Gizmo number as a callback number in DialCentral... Does DialCentral do anything different when it tries to use a Gizmo SIP number as a callback number (vs. a landline or cell number)? The ? icon next to "Phone Type" when setting up a new forwarding phone in the Google Voice web interface has the following to say: When I set this up some time ago, I selected Gizmo -- that's why it works at all. I removed the Gizmo entry and added it again to no avail. But, shouldn't using a 747-xxx-xxxx Gizmo number require something different to be done in DialCentral? I mean, you can't call a 747 Gizmo number from a landline right? It's SIP-only? Or is DialCentral just making a selection made available to it from GoogleVoice? Anyway, let me know if this totally has nothing to do with anything, and sorry for the bother if I'm way off base.