So about a year later, I transferred my phone line to nakeddsl with "not Telstra", still receiving my discount every month.
Naked DSL means you also don't need to pay for the Telstra "tax" (aka "line rental fee").
Where I live mobile phone reception in the house is non-existence. The only way is landline. With NBN installed, I got Asterisk/FreePBX installed on a RaspberryPi. My "per call" charge (and not per minute) is lower than regular landline and I don't get to pay line rental.