On an old copper landline, Triple Zero was something nobody had to think about. The line was tied to an address, it carried its own power, and the emergency operator knew where you were before you said a word. A cloud phone system changes all three of those assumptions. Calls still reach 000, but where the operator thinks you are, and whether the phone works at all during a blackout, now depend on decisions your business makes when it sets the system up.
The large Optus outages of November 2023 and September 2025, both of which disrupted calls to Triple Zero, pushed emergency calling back up the national agenda. This guide covers what has changed, what the rules require of providers, and the practical steps that are the responsibility of the business using the phone system.
This is general information
It is not legal or safety advice, and it does not replace your provider’s own emergency calling terms or your workplace emergency plan. Read both, and if anything here conflicts with what your provider tells you about its service, ask them to explain the difference in writing.
1. What the Rules Require of Providers
Australian emergency calling obligations are set mainly through the Telecommunications Act and the ACMA’s emergency call service rules. In broad terms:
- Access to 000 is required on voice services that can make calls to and receive calls from ordinary Australian phone numbers. That includes the hosted PBX and VoIP services most businesses now use.
- Emergency calls are free to the caller.
- Address information for each service is supplied by providers to the Integrated Public Number Database (IPND), which emergency services can use to identify where a fixed service is located.
- Mobiles also accept 112, the international emergency number, which connects to the same Triple Zero service.
- People who are deaf or have a hearing or speech impairment can reach emergency services through the National Relay Service, including 106 by TTY.
What the rules cannot do is make a VoIP service behave like a copper line. A cloud phone can be plugged in anywhere with internet, and the system has no physical way of knowing it has moved. That gap is where businesses need to act.
2. The Location Problem
When you call 000 from a fixed service, the operator’s systems can look up the address registered against the calling number. On a copper line that address was where the line physically ended. On VoIP it is whatever address your provider holds for that number, which may be:
- your head office, even though the call came from a branch;
- your old premises, if nobody updated it after a move;
- the office, when the call actually came from a softphone at someone’s home.
Industry arrangements exist for services that can move around (sometimes called nomadic services) so that the operator knows to ask the caller for their location rather than relying on the database. But in an emergency the safest assumption is that the address on file may be wrong, and the person calling should say where they are straight away.
| How the 000 call is made | Location the operator may see | What to do |
|---|---|---|
| Desk phone at the site the number is registered to | The registered site address | Keep the address current for every number |
| Desk phone at a branch sharing head office numbers | Possibly head office | Give each site its own number and address |
| Softphone on a laptop at home or a café | Possibly the office | Train staff to state their location first |
| Business app on a smartphone | Depends on how the app handles 000 | Check whether it hands off to the native dialler |
| Smartphone’s own dialler | Mobile network location, plus handset location where supported | The most reliable option away from the office |
Mobile apps and the native dialler
Modern smartphones can send their own location to emergency services when 000 is dialled from the phone’s built-in dialler. A call placed as a VoIP call inside a business app may not carry the same information. Many business phone apps detect an emergency number and hand the call to the phone’s own dialler instead. Ask your provider exactly what its app does, and if in doubt, tell staff to use the phone’s own dialler for 000.
3. Configure the System Properly
Most emergency calling problems in a business phone system are configuration problems that sit unnoticed until the worst possible moment. Check these with your provider or installer:
- 000 works without a prefix. Old PBXs often needed 0 for an outside line, so people dialled 0000. Make sure 000 works directly from every handset, and that 0 000 and 112 are also routed to emergency services rather than failing.
- Each site presents its own number. For multi-site businesses, emergency calls should present a number registered to the site the call came from, not a single head office number.
- Addresses are current. Confirm the service address held against every number, including after office moves, and include the floor or suite for multi-storey buildings.
- Emergency calls bypass restrictions. Call barring, credit limits and after-hours restrictions must never apply to 000.
- Someone is told. Some platforms can alert reception or a manager when a 000 call is made from any extension, so the site can guide emergency services in and unlock doors. It is worth turning on where it exists.
Do not test by calling 000
Never make a test call to Triple Zero. Ask your provider how it validates emergency call routing on your account, and check the dialling configuration in the portal instead.
4. Power and Internet Outages
A copper landline drew power from the exchange and usually kept working in a blackout. Phones on the NBN do not. If the power goes, the NBN equipment, your router and your handsets all go with it, unless you have planned for it.
- Mobiles are the first fallback. Make sure staff know to use a mobile for 000 if desk phones are dead, and that at least one charged mobile is always on site.
- A UPS on the NBN connection box, router and network switch keeps desk phones running through short outages.
- Mobile failover on the phone system keeps the business number working when the office internet drops. Uniden Voice over Cloud, for example, reroutes calls to the mobile app automatically, which we confirmed in our hands-on review.
- Battery backup for the NBN connection is available in some circumstances, particularly for fibre-to-the-premises services. Ask your provider what applies to your connection.
Mobile networks themselves can fail, as both Optus outages showed. A site with two mobiles on different networks has a fallback that a single-carrier site does not.
5. Lifts, Alarms and Medical Devices
Desk phones are the easy part. The devices most often forgotten in a migration are the ones that call for help on their own: lift emergency phones, back-to-base security and fire alarms, and medical or personal alarms. Many were designed for copper lines and may not work reliably on VoIP without an adaptor or a dedicated mobile connection.
Before moving any site to a cloud phone system, list every device that dials out automatically and confirm with the device’s own supplier how it will be connected. Our ISDN and PSTN shutdown guide covers the full list of hidden devices.
If anyone at your business, or a household relying on the service, has a life-threatening medical condition, ask the provider about Priority Assistance and the NBN medical alarm arrangements.
6. What the Optus Outages Changed
On 8 November 2023 a nationwide Optus outage lasting most of a day disrupted mobile, internet and fixed services, and some customers were unable to reach Triple Zero. The government commissioned a review (often called the Bean review, after its chair), whose recommendations covered outage handling, communication with customers and emergency calling.
On 18 September 2025, a fault during a firewall upgrade on the Optus network stopped emergency calls connecting in several states for a number of hours, and deaths were reported in connection with it. That outage prompted parliamentary scrutiny and further reform, including putting the Triple Zero Custodian, an oversight role for the whole emergency calling system, on a legislative footing and launching a broader review of Triple Zero laws in 2026.
For businesses, the lesson is less about any single carrier and more about resilience. No network is immune from failure, so the realistic goal is that a failure of one service does not leave your site with no way to call for help.
7. Brief Your People
The best configuration in the world does not help if the person calling assumes the operator already knows where they are. A two-minute briefing at induction covers it:
- Say where you are first. Street address, suburb and, in larger buildings, the floor and entrance.
- Use the phone’s own dialler on a mobile if you are away from the office or unsure how the business app handles 000.
- Dial 000 directly from a desk phone; there is no need for 0 first.
- Let reception know so someone can meet emergency services.
- Remote workers should keep their home address current with the business, and not rely on a softphone for emergencies.
8. Checklist
- Confirm the registered address for every number, including floor or suite.
- Give each site its own number for emergency caller ID.
- Check that 000, 0 000 and 112 route correctly from every handset type.
- Confirm emergency calls bypass call barring and restrictions.
- Ask how the mobile and desktop apps handle emergency calls.
- Turn on 000 call alerts to reception if the platform supports them.
- Fit a UPS to the NBN box, router and switch.
- Keep at least one charged mobile on site, ideally on a second network.
- List lifts, alarms and medical devices, and confirm how each will connect.
- Add emergency calling to staff induction and your workplace emergency plan.
Emergency calling is one part of a broader set of obligations covered in our phone system security and compliance guide. If you are choosing a new provider, add the questions above to your switching checklist.
Frequently Asked Questions
Can you call 000 from a VoIP phone in Australia?
Yes. Voice services that can make and receive calls to ordinary Australian phone numbers, including hosted PBX and VoIP services, are required to provide access to Triple Zero, and emergency calls are free. The caveats are location, because the address on file may not be where the caller is, and power, because VoIP phones stop working in a blackout without backup.
Does Triple Zero know my location when I call from a VoIP phone?
Emergency services can look up the address registered against the calling number, but on a VoIP service that may be your head office or old premises rather than where you actually are. Always state your location at the start of the call, and keep the registered address for every number current.
Should I call 000 from my business phone app or my mobile’s dialler?
If you are unsure how the business app handles emergency calls, use the phone’s own dialler. Smartphones can send location information to emergency services when 000 is dialled from the built-in dialler, and a VoIP call placed inside an app may not carry the same data. Many business apps hand emergency calls to the native dialler automatically; ask your provider.
Will my office phones work in a power outage?
Not without backup. NBN equipment, routers and VoIP handsets all need mains power. A UPS keeps them running through short outages, and staff should use a charged mobile for emergency calls if desk phones are down. Mobile failover on the phone system keeps the business number reachable when the office internet fails.
Does 112 work in Australia?
Yes, from mobile phones. 112 is the international emergency number and connects to the same Triple Zero service. On a business phone system, check that 112 is routed to emergency services rather than rejected.
Can I test that 000 works on my phone system?
Do not make test calls to Triple Zero. Ask your provider how it validates emergency call routing on your account, and check in the portal that 000 dials directly without a prefix and is exempt from call barring.