A working OBi, even if mis-configured, should give dial tone.
Try a reboot first, and confirm that the phone and cord are ok.
If no luck, report the state of all indicator lights, when the phone is on hook and when it is off hook.
Does the device show as on-line on OBiTalk portal? If not, does your router "see" it? If so, can you log into its web page? If so, report what is shown for System Status and Phone Status.
