To understand..you probably need to read my previous stuff.
Pretty boring but in a nutshell:
Three times now over the past year or so I have suddenly noticed that our Home Phone is not a-ringin' .
Found out from HELP that Call diversion was set to be on.
Wasn't requested by us.
Optus of course fixed it. But they caused it too.
And this happened again a few weeks later and now, last week it happened again.
We did NOT ask for any Call divert to be set.
Very inconvenient, I'm sure you would agree.
It appears that Landline 'Phones (NBN) require you to test regularly to check that the line actually works as paid for.