Welcome to the Community!
You can use a 3rd party VDSL2 modem as long as it allows VLAN tagging. However, homephone will only work with TPG-supplied modems.
Should you wish to proceed, here are the settings you need:
VLAN ID: 2
Connection Type: PPPoE
Username: Your TPG username
Password: Your TPG account password
Let me know if you have other concerns.