Using your landline phone in a power outage | ACMA

Using your landline phone in a power outage

Voice services supplied over the NBN will use Voice Over Internet Protocol (VoIP) technology.  This means that your voice service will only work in a power outage if all mains powered equipment (for example, the NBN network termination device, your gateway / modem / router, and a mains powered VoIP handset has a backup power supply.

If your service is provided:

  • using a fibre to the premises connection;
  • your service provider configures their VoIP service using the UNI-V port; and
  • your NBN service is provided with an NBN battery backup unit,

then your landline voice service may work in a power outage.

If your voice service is provided by other network technologies, then you may need additional equipment such as an uninterruptible power supply (UPS) to access a voice service in a power outage. A UPS costs upwards of $80 and typically provides backup battery power to attached devices for less than 10 minutes. 

However, purchasing a UPS does not guarantee a voice service will operate in a power outage. There are a number of power dependent devices in a telecommunications network that are not always backed up with battery power.

  • Are you likely to need your landline phone in an emergency?
  • Do you have a monitored medical alarm or security system that uses your home phone?

If so, consumers are encouraged to consider alternative communications such as mobile phones.

If access to voice communications is important to you during a power outage, be sure to ask your provider what devices you may need to ensure your service will work in a power outage and how long the service is likely to operate.

See also:

Will everything work?

Last updated: 25 September 2018