Log into the OBi at the IP address returned by dialing ***1. The default username/password is admin/admin (the password may have been changed by the OBiTALK Web Portal where you can find the current one).
Take a look at SP1 Service Status -> Status on the Main Status page that comes up. It should be 'Connected'.
If it says 'Not Configured', you can configure the OBi directly for Google Voice as follows:
System Management -> Auto Provisioning -> ITSP Provisioning -> Method : Disabled
System Management -> Auto Provisioning -> OBiTALK Provisioning -> Method : Disabled
Service Providers -> ITSP Profile A -> General -> Name : Google Voice
Service Providers -> ITSP Profile A -> General -> SignalingProtocol : Google Voice
Voice Services -> SP1 Service -> AuthUserName : (Google Voice username)
Voice Services -> SP1 Service -> AuthPassword : (Google Voice password)
Voice Services -> SP1 Service -> X_SkipCallScreening : (checked)
Physical Interfaces -> PHONE Port -> PrimaryLine : SP1 Service
Remember to click Submit at the bottom of any page you make changes to before leaving that page.
Click Reboot in the upper right corner after all changes have be made.