What type of NBN service do you have? What NBN box has the NBN installed?
This document from NBNCo explains the setup for a fibre NBN connection:
I am trying to get the same thing but with old number restored to new NBN fixed wireless modem.
Please read the post from Miggy1
I have just got a dial tone today from a NBN connection on the 14th. It can phone out but they didn't give old number on new service. Optus Contact seems to have gone on holiday.