When you get NBN the landline is disconnected , there is no copper , So if you have a "LandLine" as part of the package its VOIP technology anyway.
I threw away the Modem that the ISP provided (at my cost) as they had too much control over it esp if you go with Telstra , they configure your modem so anyone can use your bandwidth , its called Telstra Air or Con Wifi, I mean Fon Wifi .
I bought a TP Link Archer VR400 , bloody fabulous but no VOIP facility .

