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 cloud phone system), 5 to 20 seats (standard SMB cloud phone system, 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 cloud phone system 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. On typical asymmetric NBN plans, upload is often the tighter bandwidth limit, but VoIP uses bandwidth in both directions. A G.711 call commonly requires roughly 80 to 100 kbps in each direction after overhead, while other codecs differ. Do not estimate reliable call capacity by dividing the plan's maximum upload speed by a per-call figure; allow headroom and account for actual throughput, other traffic, latency, jitter and packet loss.The connection types that need attention are NBN FTTN (Fibre to the Node) and Fixed Wireless. FTTN upload performance can vary because of distance from the node, copper quality, premises wiring, equipment and provider-network conditions. Measure the connection's actual upload performance rather than assuming a fixed 2 to 5 Mbps range. 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. Some routers have SIP ALG enabled by default, and it can cause one-way audio, registration problems or dropped calls with some VoIP services. Check the router model and follow the phone provider's configuration guidance before changing the setting. 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 business phone company 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.Australian rules require the current telco to facilitate porting of an active portable number when properly requested, but a gaining telco does not have to accept every port. Confirm that the new provider will accept your specific number before signing up. Any business phone company 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. Individual geographic-number ports generally take 8 to 15 business days. Complex Category C services, including ISDN and multi-line bundles, have 80% completed within 15 business days, 90% within 20, and 99% within 30. See our full number porting guide for how the process works and what to watch out for.

Step 5: Understand the Cost Structure

Australian cloud phone system plans are priced primarily per seat per month. A seat is a user extension. Advertised pricing varies more widely than $15 to $45 per seat: among providers named in this guide, current plans extend from low-cost PAYG offerings below $15 to premium plans above $45. Compare user and device licences, calls, hardware, features, GST and contract terms on a like-for-like basis. Most plans include unlimited local and national calls; international calls are typically charged separately.Beyond the seat fee, watch for: Porting charges vary by provider, number type and complexity. Current named-provider examples include free simple or first ports, while complex CAT C ports can cost more than $80 and may be charged per number range., 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 business phone company 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. Telstra and Optus offer dedicated business-voice products and voice-specific support, although support channels, hours and service levels vary by product.These providers specialise in business voice, although some also sell internet and other telecommunications services. 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 business phone company 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?

A Worked Example: How a 12-Person AU Business Should Approach This Decision

A 12-person professional services firm with one Sydney office, two remote staff, and a shared reception number illustrates how the decision plays out in practice. Applying the steps above: they need 12 extensions but typically run 4 to 6 concurrent calls at peak. Their NBN connection is FTTP 50/20 Mbps, which is adequate for that volume. The main number is a Telstra PSTN landline they need to port, so any shortlisted provider must confirm they can handle Telstra fixed-line porting. Non-negotiable features: auto-attendant for the reception number, call recording for compliance, voicemail-to-email, and softphone apps for the two remote staff. They have no need for Microsoft Teams integration. Budget is $25 to $35 per user per month, totalling $300 to $420 per month. Number of staff: 12 current, possibility of 2 to 3 more in 18 months.With those inputs, the shortlist narrows to hosted cloud phone system providers rather than a self-managed SIP trunk and PBX setup. The remote staff requirement and call recording compliance need make a managed service simpler to maintain without internal IT. At $25 to $35 per user, mid-tier AU providers with those features are achievable. Confirm in writing before signing that the gaining provider will accept and manage the specific port. Statutory portability obligations do not depend on an express portability clause in the customer contract., and the provider must confirm in writing that they can port Telstra PSTN fixed-line numbers. A one-week trial with real calls should be negotiated before committing to any contract term. The most common mistake at this scale: over-engineering the initial setup with ring groups, CRM integration, and multi-level IVR before the business understands its actual call patterns. Start simple. Add features once you have 3 months of real data.

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. Microsoft Teams Phone's total cost depends on existing Microsoft licensing and the PSTN option. Teams Phone Standard is currently AU$15 per user per month excluding GST, requires a separate Teams licence and requires a calling plan, Operator Connect or Direct Routing for PSTN service. Match the product to the actual use case.Mistake 5: Locking into a long contract before testing the provider. Reputable Australian business phone companies 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.Signing a 36-month contract at the same time as choosing the system is one of the most common regrets in AU business VOIP. Feature requirements for a 12-person business in year 3 look very different from year 1, and the VOIP market changes quickly enough that a 36-month lock-in forecloses better options before they become available. Request the shortest available initial term, even if it costs slightly more per month. After 6 months of real call data, renegotiate from a position of knowledge: you know your actual concurrent call peak, your most-used features, and whether the provider delivers on their support commitments. The same principle applies to seat count: commit to the seats you have now, not the seats you expect to hire for. Overcommitting to unused seats is one of the most common sources of bill shock in AU VOIP contracts, and most providers will not credit unused seats mid-term.

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 business phone companies: 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.

Once you have selected your phone system, our guide to setting up business phones on the NBN covers the full configuration process, from NBN connection checks through to ring group setup, call flow configuration, and go-live testing.

If you are ready to compare specific options after working through the selection criteria, our guide to the best phone system for small business in Australia covers the leading AU providers with per-user pricing, feature breakdowns, and recommendations by team size and use case.

How much does a business phone system cost in Australia?

cloud phone system 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 cloud phone system companies 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 cloud phone system and VOIP?

VOIP (Voice over Internet Protocol) is the technology that carries calls over the internet rather than the traditional phone network. A cloud phone system 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 cloud phone system 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 business phone company while keeping the number. Individual geographic-number ports generally take 8 to 15 business days; complex geographic ports may take up to 30 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). VoIP can provide additional PBX features, but it is not identical to a copper landline: it normally requires premises power, and some fax, alarm, lift-phone and other legacy equipment may not be compatible. 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 cloud phone system 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 8 to 15 business days for an individual geographic-number port; a complex port may take up to 30 business days. 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.