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Hi @Edwinasajan
Welcome to the Community!
Customers can use their third party modem/router as long as it is not locked with your previous provider.
If you are on a BYO NBN plan, then you need to configure the connection type to PPPoE and use your TPG username and password. (no need to set the VLAN ID to 2).
If you are under the NBN bundled plan, then the VoIP will not work with the third party device and you need to set the VLAN ID to 2 along with the PPPoE.
BasilDV
Hey. I responded to your initial post located here.
If you wish to know how to perform the manual configuration of the connection type you may check this article, How to set up your TP-Link VR1600v modem .
Regards,
How do you configure the connection type?!