Let me clarify what exactly I'm trying to do. I want to use DialCentral accessing Google Voice. It appears that I need a SIP service that provides a virtual phone number so I can assign it as a callback number in Google Voice, which will then forward calls to my n810.

Originally I thought Google Voice was a complete solution, but it won't direct calls to the n810 without an assignable virtual callback number.

Anybody know a service that will permit this setup?