Update here. I got in contact with Obihai and they sent me, quickly, a replacement unit. However, I am experiencing the same results, no dial tone. Trying to rule everything out on my end: I plugged the telephone directly to our phone line and got a dial tone; so the telephones work. All devices - modem, router, and obihai110 are getting power as well. I tried plugging in the modem directly to the Obihai in hopes that there was some fault with the router. Same result. The lights on the Obi seem to be in order, green for power, quickly flashing for internet connection and solid for the phone line. Seriously? It seems unlikely I would get another faulty unit; but after fighting with this for an hour, ruling things out, it seems more likely...Thanks for any suggestions.