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Hi @Simocross,
Welcome to TPG Community!
We were able to locate your account using your community details and understand that you've been advised about the home phone setup for the NBN FTTC technology.
The handset needs to be connected to the designated port on the TPG modem/router. You may consider getting a base phone, which will give you a number of wireless/cordless handset to be distributed in your premises given that you have a large house.
BasilDV