Ostracus,
I'm guessing that you added your OBi202 to the same OBiTALK Web Portal account that contains your OBi110. By doing so, both Endpoints are automatically added to that account's Circle of Trust, even though they're not displayed as such in the Dashboard. The OBiTALK Web Portal assumes that all Endpoints in the same account want calls between them routed to the Auto Attendant and there's no way to specify otherwise.
If you wish to continue using the OBiTALK Web Portal, you have two options to stop the calls from being sent to the Auto Attendant:
1. Remove the OBi202 from the OBiTALK Web Portal account containing your OBi110 and place it in a separate OBiTALK Web Portal account.
2. Using OBi Expert, manually remove the applicable OBiTALK numbers from the following OBiTALK Service InboundCallRoute rules:
Voice Services -> OBiTALK Service -> InboundCallRoute:
...,{(290123456|200123456|...)>(xx.):
pli},{(290123456|200123456|...):aa},...
For additional insight, see
Using Trusted Callers and Circle of Trust.