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Hi @Scolo71,
Welcome to TPG Community!
We were able to locate your account using your community details and understand that your service is under the NBN HFC technology.
If you are looking for using a third party modem/router for HFC, then you may check this conversation from our customers that was able to use a different device. Here's the link.
NOTE:
The bundled NBN VoIP will not work on a third party device.
BasilDV