Service Providers -> ITSP Profile A -> General -> DigitMap:
(<*98:12341234567>|1xxxxxxxxxx|<1>[2-9]xxxxxxxxx|<1aaa>[2-9]xxxxxx|011xx.|(Mipd)|[^*]@@.'@'@@.)
where 12341234567 is your Google Voice number and aaa is your local area code.
If you wish to use the OBiTALK Web Portal for configuration, the instructions are here:
OBi Expert ConfigurationIf you wish to configure the OBi directly, you will also need to set:
System Mamagement -> Auto Provisioning -> ITSP Auto Provisioning -> Method : Disabled