What I have done is Spoof the MAC adress of the ATT gateway on to the edgerouter port where you connect the ONT device to. I have a couple locations set up this way. Keep the ATT gateway near by since I have noticed that after a certian time with out power the ONT box will lose the Authorized MAC address and you will need the ATT Gateway to re-auth the internet connection then move the Edgerouter back into place.
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