By default, the OBi PHONE Port should ring on an incoming call from any of the four trunks (SP1 Service, SP2 Service, OBiTALK Service, or LINE Port). In the case the LINE Port, ringing on the PHONE Port won't start until the second ring on the LINE Port has been received. This is to allow the OBi to decode any CallerID that might be present between the first and second ring so it can pass it along to the PHONE Port.