Assuming that X_RingProfile for both SP1 and SP2 are set to A (the default), and that you have not messed with any settings in Ring Profile A, then changing SP2 Service -> X_DefaultRing from 1 to 3 should result in:
A call on SP1 will ring 2 seconds on, 4 seconds off (same as before).
A call on SP2 will ring 0.8 seconds on, 0.4 seconds off, 0.8 seconds on, 4 seconds off.
If you don't want SP2 calls to ring the OBi at all, in your GV settings for that account, Phones tab, uncheck Google chat.