Please be clear: the OBi 200 is not a "router". It is an Analog Telephone Adapter, or ATA. It converts ordinary analog telephone signals to Voice over IP (VoIP) that then travels over the Ethernet cable plugged into the OBi. The analog telephone plugs into the OBi via its standard RJ-11 plastic modular telephone jack.
Are you saying that you plugged in the telephone, and when someone calls the number, the phone plugged into the OBi rings, and you can answer the call, but you cannot make outbound calls? Or, did you mean something else?