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Hi @kenneth050881 . I believe Google Wifi doesn't support VLAN ID setting needed for TPG's NBN connections (except for FTTP which doesn't use VLAN ID). You'll still need to use the supplied router (VR1600). VOIP service needs the supplied router connected to NBN box.
Read this thread. It is HFC but same things apply to FTTC.
https://community.tpg.com.au/t5/Modems-and-Devices/HFC-and-Google-Wifi/m-p/6666#M487