nbn is a disaster, page-188

I've looked it up...

It has to be Voip, but it does appear they can support existing phones although it doesn't appear to be a certainty.

"While the new FTTP network represents a shift from older, copper-based connectivity, NBN Co has stated that support for legacy telephony services is being considered for it during the transition to full voice over Internet Protocol (VoIP) services.

This will be achieved through the use of Analogue Telephone/Terminal Adapters (ATAs) that are integrated in the Optical Network Terminator (ONT) installed at customers' premises."