Assuming Google Voice is configured on SP1/ITSP Profile A, check these settings in the OBi itself:
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)
Assuming Google Voice is configured on SP2/ITSP Profile B, check these settings in the OBi itself:
Service Providers -> ITSP Profile B -> General -> SignalingProtocol : Google Voice
Voice Services -> SP2 Service -> X_ServProvProfile : B
Voice Services -> SP2 Service -> AuthUserName : (Google Voice username)
Voice Services -> SP2 Service -> AuthPassword : (Google Voice password)
All other settings can be at Default, although you'd probably want to also set:
Service Providers -> ITSP Profile x -> General -> Name : Google Voice
Voice Services -> SPx Service -> X_SkipCallScreening : (checked)
Physical Interfaces -> PHONE Port -> PrimaryLine : SPx Service
with 'x' chosen appropriately.
If you should elect to make any changes to the OBi directly, make sure you set:
System Management -> Auto Provisioning -> ITSP Provisioning -> Method : Disabled
System Management -> Auto Provisioning -> OBiTALK Provisioning -> Method : Disabled