@Strefan 

Thanks for reaching out to us. 

Generally for FTTC, there is a NBN box in user's house. User can buy a wireless router or buy a DSL modem router and set it up as a wireless router. 

For your ISP, I am not sure if they have limitation for the third party router. It's better to confirm with them. 

If there is no limitation, then you can feel free to use our Archer VR2800.