How will the NBN™ affect my home phone line and alarm?


As the NBN™ rollout continues and more and more Australian homes are upgrading to the new broadband network, you may be wondering how this will impact your existing home phone line and alarm systems. Not all phone and security equipment running over the copper landline network is compatible with the NBN™, so it’s important to make the necessary arrangements for your services so you can be confident that they’ll work as expected on the NBN™.

Whether you’re upgrading to the NBN™ in the future or you’re already on the NBN™ and looking to install a phone service or home security system, this step-by-step guide contains everything you need to know.

Step one – Find out which NBN™ technology is at your address

There’s a mix a different technology making up the NBN™ and they impact the existing landline network in different ways.

To find out which type of NBN™ is (or will be) available at your address, you can check your address on our website.

Step two – Determine what your NBN™ technology means for your home phone line

  • Areas serviced by NBN™ Fibre to the Premises (FTTP) and Hybrid Fibre Coaxial (HFC) will typically see the existing landline network completely disconnected around 18 months after NBN™ becomes available, so you will need to seek alternative phone and alarm services.
  • While it’s true that areas serviced by NBN™ Fibre to the Building, Node and Curb (FTTB/FTTN/FTTC) will utilise part of the landline network, they essentially “take over” the line and can’t share it with a traditional phone service. Non-NBN™ services using the landlines in these areas will also be disconnected roughly 18 months after NBN™ becomes available, so you will need to seek alternative phone and alarm services.
  • The existing landline network will remain connected indefinitely in areas serviced by NBN™ Wireless and NBN™ Satellite, so you can continue to use services which run over this network. You won’t need to seek alternative services your home phone line will still work.

Step three – Learn how your home phone services will be impacted

While some Aussies may be content to just use their mobiles, the home phone is still an important fixture in many households. When you upgrade to the NBN™, you can still have a home phone, however it needs to be converted to a service which runs over the NBN™ infrastructure instead of the old landline network.

  • The primary phone option available for all types of NBN™ Fibre services (FTTP/FTTB/FTTN/FTTC & HFC) is a VoIP phone line. Instead of landline network, a VoIP phone operates over your broadband connection. All you have to do is plug a standard phone handset into a VoIP-enabled modem. Provided you have an iiNet-supplied modem, our iiNet NBN™ plans are bundled with NBN™ Phone, which is a VoIP phone line. Please note that NBN™ phone will not be available if you choose to use a third-party modem.
  • NBN™ Fibre to the Premises (FTTP) customers have the unique option of an NBN™ Fibre Phone. Like VoIP, this service also operates over your broadband connection but instead of plugging a handset into your modem, the handset plugs into your NBN™ Connection Box. You can learn more about this in our NBN™ Fibre Phone FAQ.

In the majority of cases, you’ll be able to keep your existing phone number when you transfer your landline to a VoIP or NBN™ Fibre phone line. However, this option is not available for all phone carriers. If you’re interested in iiNet NBN™ services, your phone number will be checked for NBN™ compatibility as part of our online application process. Alternatively, you can give our friendly Sales Team a call on 13 19 17 and we’ll be happy to check for you.

Step four – Contact your security system provider

In the past, many home security systems such as monitored alarms operated over the landline network. Fortunately, Australian security providers have innovated their products to operate on alternative networks which also have additional benefits compared to older systems. For example, alarm systems utilising 4G Wireless and mobile technologies are typically less susceptible to physical tampering as there’s no line to cut, and backup power sources may be available to make sure the alarm is still active during a power outage.

If your property has a monitored alarm or any other kind of security system, be sure to contact your security provider before you switch to the NBN™.

NBN Co has a handy list of questions you should ask your security provider when discussing your options:

  • Will my alarm work properly when connected to the NBN™?
  • If so, what specific phone or internet service will work best with my alarm?
  • Will my alarm be able to dial out during a power outage when connected to the NBN™?
  • If not, what alternatives are available?
  • What solutions would you [the provider] suggest?
  • Are there any costs involved?

Step five – Connect your address to the NBN™

As the NBN™ experts, we’re constantly staying ahead of the curve with all things NBN™ so you can rest assured that you’ll be in good hands with iiNet on the NBN™.

iiNet has a wide range of great-value NBN™ plans and a proven track record of award-winning customer service. Most recently, we were named Internet Service Provider of the Year 2018 by Roy Morgan, a leading independent consumer research agency.

Love being organised? If your address is expected to be NBN™- ready within the next three months, you can pre-order iiNet NBN™ for a hassle-free switch and we’ll get your order rolling as soon as NBN™ reaches your door. Just pre-order online and we’ll take care of the rest. Alternatively, give our friendly Sales Team a call on 13 19 17 and we’ll help you find your perfect plan.

Get connected to iiNet NBN™


  1. Dan says:

    who pays the upgrade cost if neneccesary? clearly the owner of the property right?

    • Leo Yarnold says:

      Hi Dan,

      It is always wise to have a chat to the property owner/manager before going ahead, so you can work out who is going to bear the cost.

      – Leo

  2. ian dwyer says:

    Making me me wonder who paying the cost for other NBN machine after landline shut down as the moment how i am going use TTY machine and fax

  3. Natalie Overall says:

    Is care alert covered?

    • Leo Yarnold says:

      Hi Natalie,

      Things like health alarms are very much affected when moving to NBN, so we strongly suggest speaking to your alarm or device provider about this before moving to NBN.

      – Leo

  4. Carlos Cobelas says:

    the government has totally stuffed this up and making Australia look like a third world country.
    I have a perfectly good monitored alarm system. why the hell should I have to pay heaps of money for a new alarm system because of idiotic incompatibility issues.

  5. Cliff Kerr says:

    Great article but one eyed as you only mentioned city areas and large towns but you forgot those stuck with a satellite service that has many problems at the best of time by many factors..So it would be great to hear about that service …..

    • Leo Yarnold says:

      Hey Cliff,

      Good point, so let’s add to that!

      We do recommend that customers on NBN Satellite retain their copper landline service with their current provider, as Satellite connections do have issues with latency (responsiveness) which makes them unsuitable for VoIP applications. Therefore, there is no need to disconnect the landline and anything attached to it can be retained.

      – Leo

  6. John Roche says:

    Live in a retirement village with over 200 customers have done my best to talk to someone in management about the fact that village management will properly invite us to join a package deal with Telstra. All the phone calls and time and effort that I have spent trying to talk to iiNet so far has been a complete waste of time

    • Leo Yarnold says:

      Hi John,

      We’d love to know more about this situation that you have. Would you mind getting in touch with us directly via We can then step in and take a look to see what we can do.

      – Leo

  7. Maggie says:

    How do I access my message bank on landline now that I’m connected to NBN

  8. Mark Newby says:

    Why does my phone which is conected to iinet voip only ring 4 times before going to message mark

    • Leo Yarnold says:

      Hi Mark,

      This is usually a configuration issue with the Netphone service, which means that the Netphone service is usually setup to ring for a certain time period. You can edit this in Toolbox!

      Head over to:

      Note the section on Voice Mail and where it mentions Ring Time Before Diverting. You can use this guide and then login to Toolbox and change that time period.

      – Leo

  9. Ingvar Warnholtz says:

    In this context, when switching to NBN, I assume I get a new router.
    My son (who builds my computer) is into this in a big(?) way. He will buy his own router, and I am inclined to follow his lead (might cost me around $300). In the main he argues that the particular router’s firewall can be programmed to exclude, or stop, unwanted messages, ads, etc. to reach any WiFi attached items.
    Could you give me iiNet’s idea on how to balance VoIP, etc. as well as telling me if my “old” Uniden FP1200 could be made compatible with NBN VoIP protocols.

    • Leo Yarnold says:

      Hi Ingvar,

      Some excellent questions and comments here, thank you!

      With regards to the modem, make sure that your son chooses a modem that is NBN compatible – that is the most important choice. Some NBN types do require that the customer uses the modem we send, so if the connection is NBN HFc or NBN FTTC, then you’ll need to use the modem we send.

      With regards to the phone, most handsets should work with VoIP services, though this isn’t guaranteed.

      – Leo

  10. Brian Sherman says:

    We’ve had an iiNet Voip net phone for 18 months, and still have two problems with it:
    1. We often have to pick on the answer button a second time to connect to our caller, who tells us that they hear music between our clicks; and
    2. Although we live in a suburb of Adelaide, the time feed we get from iiNet is Queensland time.

    • Leo Yarnold says:

      Hi Brian!

      This sounds like a configuration issue with the VoIP service. Have a look at:

      This has the default settings for your Netphone and we’d suggest double checking these with what is in your modem. Pay attention to the section that mentions “SIP STATE”, as this needs to be set to SA not QLD.

      – Leo

  11. Paul Thomas says:

    The iiNet NBN phone that is bundled with the iiNet plans – can that be a cordless phone? We must have a cordless with at least 3 phones.

    • Leo Yarnold says:

      Hi Paul!

      Use can use any handsets that you like; make sure the base station is plugged into the modem’s Phone 1 port so it can distribute the calls.

      – Leo

  12. Philip McIntyre says:

    So this means I have to leave my internet on at all times in order for my VOIP phone landline to be connected yes?

  13. Gary Andrei says:

    I currently have Foxtel landline. I have been told that I will have to go to Foxtel Satellite as NBN does not allow Foxtel nor Optus to use its cables for their entertainment services. Is this true and will Foxtel Satellite be digital only ???
    Also I’ve been told that I must buy a special battery as back-up if the mains fails as to allow me to still use my landline and my back to base alarm system to operate normally. Is this also true ???

    • Leo Yarnold says:

      Hi Gary,

      Sadly we aren’t able to offer much help on this, as we have no connection to Foxtel whatsoever. However, a Google search does suggest that this is the case, as NBN HFC uses both the Telstra and Optus acquired HFC networks.

      If you do need a monitored alarm system then we’d recommend having a chat to your alarm company; they may recommend a battery backup or have an alternate solution for you.

      – Leo

  14. W Pearce says:

    Hi Gina,
    I currently have 2 landlines with 1 dedicated to Fax/alarm monitoring and live in an area where there is next to nil voice/very weak text mobile reception and no 4G signal. We are a FTTN category.
    I fear I may have neither Fax nor Monitored alarm with NBN. Currently with Iinet but internet performance has dropped dramatically over last 12 months. Any suggestions? Bill

    • Leo Yarnold says:

      Hello W,

      This is an interesting one!

      It sounds like a couple of factors are at play here:

      * Your current connection potentially has a line issue, so we’d recommend that this be troubleshot with us, first.
      * It sounds like you may have a Business service with us – we’d strongly recommend having a chat to our Business Team on 13 86 89. They’ll be able to let you know about what services you can have, what NBN is likely to be rolled out and what solutions are available to you. They can also assist with troubleshooting your current connection!

      – Leo

  15. john maysey says:

    i am connected to nbn and landline aii working ok

  16. John McClean says:

    I notice Telstra VoIP has wireless capability, so that with the aid of a voice extender, a cordless phone base station doesn’t need to be plugged into the router.
    Is it likely iinet may take this option eventually with its routers, as quite often the computer and router aren’t located near the living area where the phone is?

    • Josh McKenzie says:

      Hi John,

      Thanks for the question. You should be able to plug almost any home phone system into the Modem. Meaning DECT phones with a remote base station should work with Netphone service. As this hardware is third party meaning it’s important that we mention that it’s unsupported and we’d be unable to assist with its setup. But it should certainly work with our services. We don’t really sell physical phone handsets other than a basic handset. The other option is cordless phone handset pack where only one needs to be plugged in and there can be others around the home.

      – Joshy

  17. Darren T says:

    In re. John’s question, I have an alarm that dial my mobile when it triggered. Would it works if I plug the alarm’s phone cable to the voice extender?

    • Leo Yarnold says:

      Hi Darren,

      We’d strongly recommend that you speak to your alarm provider about this one; they’ll be able to point you in the right direction.

      – Leo