Small business phone system: the short answer
A small business phone system is the set-up that decides how your business number rings, who answers, and what happens when nobody can. For most Australian small businesses in 2026 the choice comes down to three options: a cloud phone system (VoIP or hosted PBX), a traditional landline or on-site PBX, or running everything off mobiles.
If your team works from more than one place, or you want calls to follow you between a desk phone, laptop and mobile, a cloud system is usually the most flexible. If you're a sole trader on the road, a mobile set-up may be enough. Whatever you pick, plan for the calls you can't answer, because a phone system routes calls but doesn't answer them for you.
This guide covers the phone system itself. If you're still deciding on a number (local, 1300, 1800 or mobile) or moving an existing one, our virtual phone number guide covers number types and porting.
Business phone systems compared: the three main types
| Set-up | How it works | Strengths | Watch-outs | Often suits |
|---|---|---|---|---|
| Cloud phone system (VoIP / hosted PBX) | Calls run over your internet connection; the provider hosts the system and you manage it in an online portal | Ring groups, menus, schedules and apps on any device; easy to add users | Depends on your internet connection and power at your premises | Teams of 2 or more, multi-site, hybrid or home-based |
| Traditional landline or on-site PBX | Desk phones on fixed lines, sometimes with PBX hardware in a comms cupboard | Familiar handsets; good fit for some fixed-site set-ups | Hardware to maintain; harder to take calls off-site | Businesses with existing equipment they aren't ready to replace |
| Mobile-only | Each person uses a mobile, with diverts and voicemail | Nothing to install; you're always reachable | No shared queue or menu; calls stop at whoever is busy | Sole traders and very small mobile crews |
Cloud phone system (VoIP or hosted PBX)
A cloud phone system replaces the box in the cupboard with software your provider runs for you. You get extensions for each person, desk phones or apps on laptops and mobiles, and a portal where you set rules: who rings first, what happens after hours, where unanswered calls go. Adding a new staff member is usually a few clicks, not a technician visit.
Traditional landline or on-site PBX
Some businesses still run desk phones through a PBX they own. If yours works for a single site, you don't have to replace it today. The trade-offs are hardware maintenance and fewer remote-working options. When it needs replacing, compare a cloud system before buying new hardware.
Mobile-only set-up
Plenty of tradies and consultants run their business from one mobile, and that's fine at the start. The limits show up as you grow: no shared queue, no menu, and calls go to voicemail when you're on the tools.
What a VoIP phone system for small business needs
Before signing up for VoIP, check the basics:
- A reliable internet connection. Voice calls don't need a lot of bandwidth, but they're sensitive to drop-outs. Ask the provider what they recommend per concurrent call and test at your busiest time of day.
- A router that handles voice well. Some providers supply or recommend routers with voice prioritisation (quality of service settings) so calls don't break up when someone uploads a large file.
- Devices. Decide who needs a desk phone, a softphone app with a headset, or a mobile app.
- A fallback. Set a rule that sends calls to a mobile, or to an answering service, if your internet drops. Our call forwarding guide explains busy, no-answer and unreachable rules in detail.
Features that matter (and the ones you can skip)
These are the features that change how calls get answered:
- Call routing and ring groups. Ring several people at once, or in order, so calls don't stop at one busy person.
- Business-hours schedules. Calls behave differently during opening hours, lunch, after hours and public holidays.
- IVR or auto attendant. A "press 1 for bookings, 2 for accounts" menu. Useful for clear departments, frustrating when it's too long. Our IVR vs AI receptionist guide compares menus with a receptionist that simply asks what the caller needs.
- Voicemail to email or text. Messages arrive where you'll actually see them.
- Call recording. Handy for training and disputes. Check the consent and notice rules that apply to your business before you switch it on, and tell callers.
- Multi-device apps. Answer the business line on a desk phone, laptop or mobile without giving out a personal number.
- Integrations. Caller details that pop up from your CRM, or calls logged in your job management software.
- Reporting. Missed-call and wait-time reports show where calls are being lost.
NBN, power outages and Triple Zero
If your phone system runs over the NBN, the power question matters. NBN Co's page on what happens in a power blackout says that on Fibre to the Premises, the NBN connection box needs power to work, and unless you have battery back-up and a corded phone correctly connected, your phone will not work during a blackout. It also notes each mains-powered piece of equipment needs its own battery back-up.
The ACMA's emergency calls page says most services connected to the NBN won't work during a power outage, so you won't be able to call 000 on them, and suggests having another way to call, such as a charged mobile. It also notes that when you call 000 from a VoIP service, the operator will ask for the town and state you're calling from, because you may not be at your billing address.
The ACMA notes that NBN Co stopped taking orders for its backup battery unit in May 2024, but telcos must still tell customers about the impact of power outages on NBN services at the point of sale (ACMA, backup power rules). In practice:
- Keep a charged mobile on site for emergencies.
- Ask the provider what happens to your calls in a power or internet outage. A cloud system can usually reroute calls to mobiles automatically.
- If you have monitored alarms, lift phones or other equipment on a phone line, check with the equipment supplier before you change anything.
How to compare costs without guessing
Providers bundle things differently, so headline prices are hard to compare. List every cost line and ask each provider to fill it in:
- Monthly fee per user or extension, and the minimum number of users
- Included call minutes, and rates to landlines, mobiles and 13/1300 numbers once you exceed them
- Inbound costs if you use a 1800 number
- Handsets, headsets and any router, bought or leased
- Set-up, configuration and installation fees
- Add-ons such as call recording, extra menus, integrations or reporting
- Contract length, and fees to leave early
Ask for the Critical Information Summary for each plan so you're comparing the same items. Then add the cost nobody quotes: calls that go unanswered. If customers ring once and then call someone else, a cheap system with poor routing can cost more than it saves.
Questions to ask a provider
- Can calls ring desk phones, laptops and mobiles at the same time?
- Can I set business-hours, after-hours and public-holiday rules myself in the portal?
- Can unanswered calls forward to an external number, such as an answering service or AI receptionist?
- What happens to my calls if my internet or power goes down?
- Is support based in Australia, and what are the support hours?
- Is there a minimum term, and what does it cost to leave?
- Which integrations work with the software we already use?
Where an AI receptionist fits on top of your phone system
A phone system decides where calls go. It doesn't answer them. Ring groups help until everyone is busy; then calls ring out or land in voicemail, and many callers won't leave a message.
That's where an AI receptionist fits. Whichever system you choose, you point unanswered calls, or all after-hours calls, at Miyai. It answers in your business name, handles common questions from your approved business information, takes the caller's name, number and reason for calling, books appointments if you allow it, and sends you a summary straight away. You keep your phone system and your number.
A typical set-up:
- Business hours: the ring group rings your team first. Anything unanswered after about 15 to 20 seconds goes to the AI receptionist.
- After hours: a schedule sends every call straight to the AI receptionist.
- Busy periods: overflow calls go to the AI receptionist instead of a queue.
If you're weighing up who should answer, our phone answering service guide compares human, AI and hybrid options, and the cloud phone answering service guide shows how answering connects to a cloud system. For a receptionist that covers your phones end to end, see virtual receptionist Australia.
Miyai's Growth voice plan is $199 AUD/month, and website chat is $19 AUD/month, both paid through Stripe before access. Details are on pricing.
A quick test before you choose
Before you sign anything, ring your own business number at three moments: a busy morning, lunchtime and just after closing. Note who answered, how long it rang and where the call ended up. That five-minute test shows which features you actually need (ring groups, schedules, a menu or an answering layer) better than any feature list. Once your system is set up, our phone etiquette guide has greeting, hold and message scripts for your team.
FAQ
What is the best phone system for a small business in Australia?
There isn't one best system for everyone. A cloud phone system suits most teams of two or more and anyone working across sites or from home. A mobile set-up can suit a sole trader. Choose based on how your calls are answered today, not the longest feature list.
Is VoIP the same as a cloud phone system?
Mostly. VoIP is the technology that carries calls over the internet. A cloud phone system, or hosted PBX, is a full business phone system built on VoIP and run by a provider.
Do I need a new phone number to switch systems?
Usually not. Many businesses keep their existing number. Our virtual phone number guide explains number types and porting.
Will my business phones work in a power outage?
Most NBN-connected phone services won't work without power, according to the ACMA. Keep a charged mobile for emergencies and ask your provider how calls are rerouted during an outage.
Can an AI receptionist work with my existing phone system?
Yes. Most systems can forward unanswered or after-hours calls to an external number, which is how an AI receptionist connects.
Next step
Pick the system type that matches how your team works, check your internet and power fallback, and decide where calls go when nobody can answer. If that answer is "voicemail", put an AI receptionist behind your phone system so every call gets answered in your business name. Get started when you're ready.