How to Choose a Business Phone System in Australia (2026 Checklist)

This guide gives Australian business owners and office managers a practical decision framework for choosing a phone system, based on how the Australian VOIP market actually works in 2026. By the end, you will know what type of system fits your team size, which features are worth paying for, what NBN and infrastructure considerations apply to your situation, and what questions to ask providers before signing anything. The framework works for businesses with 1 seat or 50 seats.

Start Here: Reverse the Way You Are Thinking About This

Most businesses approach a phone system purchase the wrong way. They start with the hardware: which desk phone looks good, which brand has a good reputation. The right order is the opposite. Start with the service provider and the type of phone system, understand what you need it to do, and choose handsets last. A Yealink desk phone is useless without a VOIP service to connect it to. The service is the phone system. The handset is just a terminal.The reason this matters: if you buy handsets before choosing a provider, you may buy hardware that is not compatible with the provider you eventually choose, or hardware that your provider will want to replace with their own pre-configured equipment. Start with the service. See our best VOIP phone system guide for Australian small businesses for a shortlist of providers to evaluate alongside this framework.

Step 1: Define How Many People Need Phones

Seat count is the starting point for every phone system decision. It determines the system type that makes sense, the plan structure you should be looking at, and the rough monthly cost. Be precise: count the staff who need to make and receive calls as part of their job, not the total headcount. A 15-person business where 10 staff are warehouse workers who do not take calls needs a phone system for 5 seats, not 15.The seat count tiers that matter in the Australian VOIP market are approximately: 1 to 5 seats (micro business, entry-level hosted PBX), 5 to 20 seats (standard SMB hosted PBX, most AU providers optimise for this range), 20 to 50 seats (mid-market, some providers price more competitively at this tier), and 50 seats plus (mid-enterprise, where self-hosted or SIP trunk options start to become economically relevant). For a detailed look at sizing for a specific headcount, see our guide to phone systems for 10 employees.

Step 2: Decide Which Features You Actually Need

The feature list for modern hosted VOIP systems is long and most of it is irrelevant to the average small business. Focus on the features that directly affect your callers' experience and your staff's daily workflow. The core features that almost every business needs are: inbound call handling (auto-attendant or direct dial), call transfer between staff, voicemail with email delivery, hold music, and a mobile softphone app for staff who take calls away from their desk.Features worth explicitly confirming with each provider, because they vary in quality or availability: after-hours call routing (sends calls to voicemail or a mobile outside business hours), ring groups (routes calls to multiple staff simultaneously or in sequence), call recording (recordings saved and accessible, not just technically possible), and 1300 or 1800 number support if you have or want an inbound number. See our guide to call flow design for small businesses for a framework to map out exactly how you want calls handled before speaking to providers.Features that sound useful but that most small businesses do not use enough to justify a premium: CRM integration, advanced call analytics, call centre queuing, video conferencing. Unless you can point to a specific workflow that requires these features today, do not pay for them.

Step 3: Assess Your NBN Connection

All VOIP systems in Australia run over the internet. Your NBN connection type and speed determine how many simultaneous calls your system can support and how reliable call quality will be. The upload speed is the constraint, not download. Each simultaneous call uses approximately 85 to 100 kbps of upload bandwidth. A standard NBN 25 plan with 5 Mbps upload can support approximately 40 to 50 simultaneous calls in theory, which is more than most SMBs will ever use.The connection types that need attention are NBN FTTN (Fibre to the Node) and Fixed Wireless. FTTN upload speeds vary significantly by distance from the node and can be as low as 2 to 5 Mbps on a congested line. Fixed Wireless can experience latency spikes that affect call quality. If your business is on FTTN or Fixed Wireless, confirm your actual upload speed before committing to a phone system. Most providers can tell you whether your connection is suitable for your expected call volume.One NBN-specific issue to check: SIP ALG. Many NBN modem-routers have SIP ALG (Application Layer Gateway) enabled by default. SIP ALG intercepts VOIP traffic in a way that causes call drops, one-way audio, and registration failures. Virtually every VOIP provider recommends disabling it. Confirm your router supports this setting and that you or your IT contact can make the change.

Step 4: Decide What to Do With Your Existing Number

If you have an existing phone number on a Telstra, Optus, or other carrier service, you need to decide whether to port it to your new VOIP provider or accept a new number. For most established businesses, keeping the existing number is the right call: customers already know it, it is on your website and marketing materials, and changing it creates a communication burden.Number porting in Australia is a legal right. Any VOIP provider worth using will support porting your existing number across. Confirm this explicitly before signing up and ask about their porting timeline for your specific number type. Standard geographic numbers typically port in 5 to 10 business days. Complex services (ISDN, multi-line bundles) take longer. See our full number porting guide for how the process works and what to watch out for.

Step 5: Understand the Cost Structure

Australian hosted VOIP plans are priced primarily per seat per month. A seat is a user extension. Standard pricing for a quality Australian hosted VOIP provider ranges from $15 to $45 AUD per seat per month depending on the provider, the plan tier, and included call minutes. Most plans include unlimited local and national calls; international calls are typically charged separately.Beyond the seat fee, watch for: a one-off porting fee (typically $30 to $80 AUD per number), hardware costs if you need desk phones (entry-level SIP phones from $89 AUD, mid-range from $200 AUD), and any setup or installation fees. Some providers waive setup fees for direct sign-ups. Ask for a total first-year cost estimate, not just the monthly per-seat fee, to compare providers properly. For a full breakdown of what VOIP should cost, see our VOIP pricing guide for Australian businesses.

Step 6: Choose Between a Specialist VOIP Provider and a Big ISP

Many Australian businesses default to buying their phone service from the same provider as their internet (Telstra, Optus, TPG). This is understandable but usually not the best outcome. Big ISP phone services are typically bundled products optimised for retention rather than for call quality or features. Their support is oriented around broadband, not business voice.Specialist Australian VOIP providers (Maxotel, Vonex, VoIPline, Crazytel, and others) focus entirely on business voice. They understand number porting, NBN compatibility, call flow configuration, and AU regulatory requirements in a way that a generalist ISP does not. Their support is usually faster and more knowledgeable on voice-specific issues. For most Australian SMBs, a specialist VOIP provider will deliver a better outcome at a comparable or lower price than buying voice from an ISP.

Questions to Ask Every Provider Before Signing

Before committing to any provider, get clear answers to these questions. Any provider that cannot or will not answer them clearly is a red flag.

• Do you support porting my existing number from [current carrier]? If yes, what is the typical timeline and is there a porting fee?
• What is the monthly cost per seat, all-in? Are there any additional fees for call recording, ring groups, or after-hours routing?
• Do you have a minimum contract term? What are the exit terms?
• Where is your support team based? What are the support hours and what is your typical response time for a call quality issue?
• Do you pre-configure handsets? If I order phones through you, are they set up and ready to use out of the box?
• What happens to my calls if your platform goes down? Do you have failover to mobile?
• Do you support 1300 numbers? If I want one added later, what is the process and cost?

What Most Businesses Get Wrong When Choosing a Phone System

Mistake 1: Buying handsets before choosing a provider. The most common error. Handsets bought independently may not be compatible with the provider's provisioning system, or the provider may want to supply and configure their own hardware. Always choose provider first.Mistake 2: Choosing the cheapest plan without checking what it excludes. Phone system pricing that seems very low often excludes call recording, ring groups, or concurrent call limits. A plan that prevents more than two simultaneous inbound calls is effectively unusable for a business that gets more than occasional inbound traffic. Read the plan details carefully.Mistake 3: Not testing call quality before porting your number. Sign up for a trial or temporary number, test the system with real calls on your NBN connection, and confirm call quality before porting your main business number across. Undoing a port that has already completed is time-consuming.Mistake 4: Overbuying features for a team that just needs to make and take calls. Paying for a UCaaS platform like Microsoft Teams Phone when your team primarily needs calls, voicemail, and an auto-attendant means paying a significant monthly premium for video and messaging features that go unused. Match the product to the actual use case.Mistake 5: Locking into a long contract before testing the provider. Reputable Australian VOIP providers offer month-to-month plans. Be cautious of providers who push 24 or 36 month contracts for a small business. The industry is competitive enough that you should not need to commit long-term to get a fair price.

Your Next Steps

1. Count your seats: how many staff need phone extensions?
2. Map your call flow: how do you want inbound calls to be answered, routed, and handled after hours?
3. Check your NBN connection type and upload speed: confirm it is suitable for your expected simultaneous call volume.
4. Decide on number porting: do you want to keep your existing number? Confirm it can be ported before signing up with any provider.
5. Get quotes from two or three Australian specialist VOIP providers: ask for all-in monthly cost per seat, porting fee, and contract terms.
6. Request a trial or test number: use it to test call quality on your actual NBN connection before porting your main number.
7. Sign up and configure: set up call routing, voicemail, and ring groups using the temporary number before your main number ports across.

How much does a business phone system cost in Australia?

Hosted VOIP plans for Australian businesses typically cost $15 to $45 AUD per seat per month from specialist providers. A 5-seat business on a mid-range plan pays approximately $125 to $175 per month. Add one-off costs for number porting ($30 to $80 per number) and hardware if you need desk phones ($89 to $350 per handset). For a full breakdown, see our VOIP cost guide.

Do I need a physical desk phone, or can my team use their mobiles?

Most hosted VOIP providers include a softphone app that turns a mobile or laptop into a full phone system extension. For staff who primarily work at a desk and handle significant call volume, a desk phone is more ergonomic. For staff who move around or work remotely, the softphone app is sufficient. Many businesses use a mix of desk phones for reception and admin, and softphone apps for everyone else.

What is the difference between a hosted PBX and VOIP?

VOIP (Voice over Internet Protocol) is the technology that carries calls over the internet rather than the traditional phone network. A hosted PBX is the phone system software that manages call routing, extensions, voicemail, and other PBX features, delivered as a cloud service. Most Australian business phone systems are hosted PBX products that use VOIP to carry calls. The two terms are often used interchangeably in the market.

Can I keep my existing phone number when I switch providers?

Yes. Number porting is a legal right in Australia under ACMA regulations. You can transfer your existing geographic number or 1300 number to a new VOIP provider while keeping the number. Standard geographic numbers typically port in 5 to 10 business days. Keep your existing service active until the port completes.

Is a business phone system the same as a landline?

Not anymore. Traditional landlines used the PSTN copper network, which was shut down in Australia in 2025. Business phone systems today are delivered over the internet (VOIP). They provide the same functionality as a traditional landline and more, but the underlying technology is digital rather than copper. If you currently have a Telstra or Optus phone service, it is already running over a digital network.

How long does it take to set up a business phone system?

A hosted VOIP system can be provisioned and operational within a few hours of signing up. The delay is almost always number porting rather than setup: if you are keeping your existing number, allow 5 to 10 business days for a standard geographic number port. During the porting window, you can use the temporary number your provider gives you to test the system and train staff before your main number moves across.