My research led me to the following forum:
and some more with similar problem. Looks like there is no solution but to get it replaced. How can I file an urgent warranty claim as I bought it almost a year ago (a few days less than a year actually).
The company must be in good health to have such high customer service standards.
I hope the replacement telo works for me.
It has been working well last month, until Sunday AM. Waking up and found I had no phone nor internet. The Cox network was down. I kept resetting the router, the internet came back but not the phone. 3 top lights were flashing.
So I changed and put the OOMA behind the router. Worked but no incoming ring. Bummer.
I reset the system tonight and I couldn't get it work again. 3 light flashing problem remains. Incoming phone went directly to the voice mail.
Mine is only 1.5 month old.
Hmm... I suspected Cox had something to do with this.
I turned off the cable modem and disconnect the coaxial over night. This AM, I reconnected the coaxial and let the modem booted up. I connected the router, then connected the OOMA behind the router.
The OOMA booted up, then 3 light flashing again. I said "oh Sh", but about minute later they disappeared and the blue light came up. Everything works OK now.
I also figured out that the reason for no incoming ring was due to the mail light was inadvertently activated (red). I push on this light and hold for few seconds, then it turned blue and everything works OK ever since.