Tabby - welcome to the forum.
When you set your OBi voice gateway for your softphone, the sofphone number is put into your "Circle of Trust". Confusingly, this does not show in the "Circle of Trust" settings. Anyhow, what this means is that if you dial your OBi100 number from OBiON you should get the auto attendant which gives you three options. If you press "1", then you OBi100 phone should ring.