Hi khantpr,
Just to confirm, when you log in to your OBI, under System -> System Status -> SP1 Service Status -> Status,
Does it say "Connected" ?
Since you said you have no dialtone, I just wanted to double-check that your SP1 Status is Connected. If all of your settings check out, then perhaps the Phone Port on the OBI has become damaged or is defective. If this turns out to be so, you may need to contact Obihai at that point. For now, let us know if you have any more information on your OBI configuration status. Worst case scenario, you could reset the OBI to factory settings and then see if you have a dialtone.
pc44