Connect a network cable from your Ooma Telo Internet port to one of the router LAN ports.
Power the Ooma Telo.
Are you seeing at the Ooma Telo Internet port two tiny lights, one solid, and one flashing once in awhile?
If you aren't you Ooma Telo is probably defective. It could be your power adapter or the Ooma device. If you do see these lights, let your Ooma Telo boot as far as it will boot. If it boots all of the way, stop here.
Temporarily access Ooma Setup by connecting a network cable from the Ooma Telo Home port to the wired LAN port of a computer. Temporarily turn off Wi-Fi in the computer. Restart the computer. Type http://172.27.35.1
in your computer browser window. The Ooma Setup pages should open.
Click on Internet, go to Connection type: and click the down arrow. Select Dynamic (DHCP).
Go down to INTERNET Port MAC Address: and click on Use Built In. Click on Update Device.
Reboot the Modem/Router. When the Router is done booting, reboot the Ooma Telo.
If these things doesn't help contact Ooma Customer Service. Maybe they can see something from their side.
If your Ooma Telo is defective and within the one year warranty period, Ooma will send you out shipping prepaid a replacement Ooma Telo, along with a prepaid shipping label to return the defective Ooma Telo.
Phone: 1-888-711-OOMA (6662)
Monday-Friday 7am-7pm PST
Saturday-Sunday 8am-5pm PST