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Just to clarify does your phone connect to a green phone port in the back of your modem, which conects to the NBN box on the wall or does it still connect to phone socket on the wall?
If its connecting to the back of your modem then your copper line would have been disconnected. In general fax doesnt work on consumer NBN unless you have NBN FTTP or if the copper line stays active on fixed wireless.
Although I am a Telstra Employee, I am not here in an official capacity. My opinions are my own and not that of Telstra's.