First: power off your router, your OBi device, and any Ethernet switches in between the two. Wait a minute, then power on the router. Wait at least 5 minutes for the router to reboot and reconnect itself to your ISP. Plug the OBi device directly into your router, using a different Ethernet cable. Make sure the connections are secure. Power on the OBi and wait a few minutes for it to reboot.
Pick up the phone and enter ***1. Does it now get an IP address?