No worries about the duplicate posts - it's not your fault. The forum software is awful.
RE: ringing the OOMA phone, it's up to you. If it's now redundant, then remove the check mark/toggle it off. Google Voice simultaneously forwards to up to six 10-digit telephone numbers, any OBiTALK device, and any Hangouts client that is set to ring on inbound calls. Whichever one gets answered first wins.