You need to use OBi Expert to configure your OBi200 for these changes.
The OBi200 has 20 ring patterns, 2 ring profiles and 10 ring patterns per profile. I believe when you define GV SP1 and SP3 use Profile A and SP2 and SP4 use Profile B. You just have to change the ring pattern.
Go to:
Voice Services -> SPx Service -> X_DefaultRing
Select a unique ring pattern number for each SP.
To see the ring pattern definitions go to:
Ring Settings -> Ring Profile A/B
GV delivers an 11 digit CallerID with a leading "+". You can alter the CallerID in the inbound call route. SP1 you can just remove the "+". The other SP's you can remove the "+1" and replace with the corresponding SP number. If the CallerID doesn't fit this pattern, it won't be changed.
Voice Services -> SP1 Service -> X_InboundCallRoute: {(<+:>1xxxxxxxxxx):ph},{ph}
Voice Services -> SP2 Service -> X_InboundCallRoute: {(<+1:2>xxxxxxxxxx):ph},{ph}
Voice Services -> SP3 Service -> X_InboundCallRoute: {(<+1:3>xxxxxxxxxx):ph},{ph}
Voice Services -> SP4 Service -> X_InboundCallRoute: {(<+1:4>xxxxxxxxxx):ph},{ph}