With FTTN (and FTTC) if you have any parallel phone cabling in your home, it should be disconnected/isolated from the first socket connected to the lead-in, that the NBN modem needs to be plugged into.
The lead-in cable from the street should go directly to the socket the modem will be connected to.
There should be one socket on the modem for a phone handset to be connected.
If you require any other phone sockets to be working, that phone handset socket on the modem gets connected back to the rest of the existing phone cabling in the house.
If the lead-in cable doesn't currently terminate on the socket where the modem is to be plugged it, then cabling changes need to be performed so that it does.
It is possible for NBN to work when other sockets are still connected across the line (eg: not isolated from the lead-in) but doing so can severely slow the NBN data rate down.
Any devices plugged into parallel sockets across the lead-in socket will not function as they previously did... they must be connected to the output line connection on the modem.
If any other devices are across the lead-in (eg still parallel connected... answering machines, ADSL modem, extension ringer, additional handsets, etc) not only will those devices not work, but they can block the NBN signal from getting to the modem correctly.
Everyone blames NBN for speed issues (sometimes they are correct of course) however, incorrect premises cabling is the single most-common issue with NBN speed issues.
I see this almost on a daily basis.
Any of the the above premises cabling is the responsibility and cost of the owner/occupier.
NBN installers do not provide those additional cabling services.
Any licensed cabler can perform the work and it's best to have it done prior to the NBN connection.
That way, you know if there is any issue with the NBN connection to the modem, it
is their problem.
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