There should be no configuration needed. Just connect the Ethernet cable that comes with the Ooma to one of the Ethernet ports on the back of the modem.
I did plug an ethernet cable in the Ooma Telo and the modem but the telepone port on modem did not on or flush.
Also tried plug a phone cable from Ooma Telo and modem but still did not work.
On Exfinity Wifi screen, Ooma Telo is connected to the modem wireless.
Thanks for help.