Business Phone System Australia: Types, Pricing and How to Choose (2026)

This guide covers every type of business phone system available to Australian businesses in 2026 -- what each is, what it costs, who it suits, and how to choose. If you are on a basic ISP phone line and wondering whether to upgrade, or if you are comparing hosted cloud PBX options and want to understand what the differences actually mean in practice, this is the reference page to start from.

The Five Types of Business Phone System in Australia

Hosted Cloud PBX: The Standard Choice for Australian SMBs

A hosted cloud PBX is the most practical phone system for the majority of Australian small and medium businesses. The PBX software -- the exchange that handles routing, ring groups, voicemail, IVR menus, and call queuing -- runs on the provider's servers. You connect to it with SIP desk phones, a softphone app on your laptop or mobile, or both. You pay a monthly per-seat fee. There is no on-site PBX hardware to maintain, no expensive upfront licensing, and no configuration that requires an on-site technician.

Australian hosted cloud PBX providers include Maxotel, SIPcity, Aussie Broadband Business Voice, VoIPline, Crazytel, and several others. Pricing ranges from $20 to $50 per seat per month depending on the provider and feature set. At this price point, you get: auto attendant (IVR menu), ring groups, call queuing, voicemail to email, direct inward dial (DID) numbers, call recording, and mobile app access. These are features that cost thousands per month on legacy systems five years ago.

The hardware requirement is the main upfront cost: SIP desk phones compatible with your provider's platform. A mid-range SIP desk phone (Yealink T33G, Grandstream GRP2602P) costs $80 to $160. A premium desk phone with Wi-Fi and Bluetooth (Yealink T54W) costs $270 to $280. For businesses that do not need a physical handset, softphone apps (desktop or mobile) come with most hosted PBX subscriptions at no additional hardware cost.

See our guide to the best VOIP phone systems for small business in Australia for a current provider comparison, or our best SIP desk phone guide for hardware recommendations.

On-Premise PBX: Who Still Uses It

An on-premise PBX is a physical hardware system installed at your office that manages call routing internally. The hardware typically cost between $5,000 and $50,000 to install, plus annual maintenance, plus licensing for additional lines or features. On-premise PBX systems from Cisco, Avaya, NEC, and Alcatel-Lucent were the standard for mid-sized Australian businesses for decades.

In 2026, on-premise PBX for new deployments makes sense in a narrow set of circumstances: large organisations with 100+ users that need on-site call processing, businesses with specific compliance requirements that prohibit cloud data storage, and government or healthcare environments with strict network segregation requirements. For Australian SMBs with fewer than 50 staff, on-premise PBX is not a practical choice -- the upfront cost, maintenance burden, and the fact that the PSTN copper network it was designed to connect to is being decommissioned make it a poor investment.

If your business inherited an existing on-premise PBX and it is still working, you can extend its life by connecting it to a SIP trunk instead of a PSTN line (this keeps your existing handsets while moving the PSTN connection to VOIP). But new on-premise PBX installations for SMBs are rare and are not covered in depth in this guide.

Microsoft Teams Phone: When It Makes Sense

Microsoft Teams Phone adds cloud PBX functionality (IVR, call queuing, voicemail, ring groups) to your existing Microsoft Teams subscription. It requires a Teams Phone Standard add-on licence (~$10-12/user/month on top of your existing Microsoft 365 subscription) plus a calling architecture: either Microsoft Calling Plans, Direct Routing via a certified SBC, or Operator Connect through a certified AU carrier.

Teams Phone is the right choice when your business is already deeply embedded in the Microsoft 365 ecosystem (SharePoint, Exchange, Teams for meetings and chat) and you want a single platform for both communications and collaboration. The main limitations: Microsoft Calling Plans do not support 1300 or 1800 numbers in Australia (you need Direct Routing or Operator Connect for those); the licensing stack is complex and more expensive than most businesses expect; and call quality depends on Microsoft's network routing, which can introduce latency for Australian calls that route via overseas servers.

For a full breakdown of Teams Phone costs in AUD, see our guide to Microsoft Teams Phone for Australian businesses and our Teams Phone pricing guide.

ISP ATA Service: Why It Is Not a Business Phone System

When Australia rolled out the NBN, ISPs migrated voice services onto VOIP delivered via an Analogue Telephone Adapter (ATA) -- the green phone port on the side of your NBN modem. This service typically supports one phone handset and one concurrent call. It is technically VOIP but it has none of the features of a business phone system: no ring groups, no IVR, no call queuing, no voicemail to email, no call recording, no multiple simultaneous inbound calls.

Many Australian small businesses are unknowingly running their entire business phone operation off this green port. It works for a sole trader who receives occasional calls. It fails the moment two customers call simultaneously, the moment you want to send calls to a different number after hours, or the moment you hire a second person who also needs to make and receive calls on the business number.

How Many Phone Lines Does Your Business Actually Need?

The concept of "phone lines" works differently with hosted cloud PBX than with traditional PSTN. Instead of physical lines, cloud PBX systems provision concurrent call paths -- the number of calls that can be active simultaneously. Most providers include sufficient concurrent paths in each seat licence.

As a rough guide for Australian SMBs:

• 1-3 staff: 2-3 concurrent call paths, 2-3 SIP seats. One number with a ring group covering all three staff is sufficient for most small operations.
• 4-10 staff: 4-6 concurrent call paths. A ring group for inbound, individual extensions for each staff member, one number for the main line. You may want a separate direct dial for a manager or reception.
• 10-25 staff: 8-12 concurrent call paths. Separate ring groups by department (sales, support, admin). IVR menu to route callers before they reach a person. Consider a dedicated receptionist extension.
• 25+ staff: Requires a more detailed seat-by-seat analysis. Not all staff need desk phones -- field staff and remote workers are often served by softphone apps. Count only the seats that need active phone access simultaneously.

Use our phone lines calculator to estimate your concurrent call requirements based on your call volume and business hours.

Features to Look For: What Actually Matters

Every hosted PBX provider lists features, but not all features matter equally for every business. Here is an honest breakdown of which features genuinely differentiate providers for Australian SMBs:

Features most businesses need:

• Ring groups: Multiple phones ring when the main number is called. Essential for any business with more than one person answering calls.
• Time-based routing: Automatically switches to after-hours handling at a configured time. If this requires manual switching, it will eventually be forgotten.
• Voicemail to email: Voicemails delivered as audio attachments to email. Reduces missed messages by an order of magnitude versus checking a phone voicemail box.
• Number porting: The ability to move your existing business number to the new provider. Confirm this is supported before signing up.
• Mobile app / softphone: Staff who work remotely or in the field need to make and receive calls on the business number from their mobile. A softphone app handles this without call forwarding costs.

Features that matter for specific use cases:

• IVR / auto attendant: Press 1 for sales, press 2 for support. Useful for businesses with more than 5 staff or multiple departments. Unnecessary for a sole trader.
• Call recording: Required by some industries (financial services under ASIC obligations, legal, accounting for TPB compliance). Check state recording consent laws -- all-party consent is required in VIC, NSW, SA, WA, ACT, and TAS.
• CRM / PMS integration: Screen-pop (client record appears when they call) and click-to-dial. Valuable for medical practices (ezyVet, RxWorks), accounting firms (XPM, MYOB Practice), and real estate (REI Cloud, Console). Not all providers support all integrations -- confirm explicitly.
• 1300 / 1800 number support: If your business uses a 1300 or 1800 number, confirm your provider can port and manage it. Not all cloud PBX providers support 13/1300/1800 numbers in Australia.
• BLF (Busy Lamp Field): See at a glance which colleagues are on a call. Useful for reception desks that transfer calls. Requires compatible SIP desk phones with programmable keys.

What to Budget for an Australian Business Phone System

Budgeting for a hosted cloud PBX in Australia involves three cost categories:

Ongoing service costs: $20 to $50 per seat per month depending on provider and feature set. A 5-seat business pays $100 to $250 per month. Call costs are typically included (local and national calls free; mobile calls $0.10 to $0.15/minute; international varies). 1300 number rental adds $10 to $30/month depending on the number type and provider.

Hardware (one-off): SIP desk phones cost $79 to $280 each depending on the model. A 5-seat office with a mix of reception and staff phones (1 x T46U at $259 + 4 x T33G at $130) = approximately $779 in hardware. Add a UPS ($150 to $200) to protect against short power outages. Total hardware budget for a 5-seat office: $800 to $1,200.

Setup and porting: Most providers charge $0 to $100 for account setup. Number porting (keeping your existing business number) costs $20 to $50 per number and takes 5 to 10 business days. For businesses with multiple numbers, each ports separately.

Total first-year budget (5-seat business): $2,000 to $4,200 including hardware, porting, and 12 months of service. From year two, ongoing service costs $1,200 to $3,000 per year. Compare this to a Telstra Business bundle at $180 to $250 per month ($2,160 to $3,000 per year) with a fraction of the features.

The NBN Requirement

All hosted cloud PBX systems require a working broadband connection. In Australia, this means NBN (FTTP, FTTN, FTTC, HFC) or a business-grade fibre or cable service. The NBN connection itself does not need to be expensive -- NBN 50 or NBN 100 is sufficient for most small businesses. What matters is stability and low latency, not raw download speed.

VOIP call quality requires approximately 100 kbps of bandwidth per concurrent call (upload and download), very low latency (under 150ms ideally), and minimal packet loss (under 1%). These requirements are easily met by any decent NBN connection. The most common cause of poor VOIP call quality on NBN is not the connection itself -- it is SIP ALG (Session Initiation Protocol Application Layer Gateway) enabled on the router, which interferes with SIP signalling. Disable SIP ALG on your router before deploying a cloud PBX system.

For guidance on configuring your NBN router for VOIP, see our guide to setting up business phones on NBN in Australia.

Choosing an Australian Hosted VOIP Provider

The Australian hosted VOIP market has consolidating around a core group of providers who serve the SMB segment. When comparing providers, these criteria matter most:

Australian number support: Can the provider provision and manage geographic numbers (02, 03, 07, 08), 1300, and 1800 numbers? This is table-stakes but worth confirming -- some providers have gaps in 13/1300/1800 support.

Australian support hours and location: Is support available during Australian business hours? Is the support team in Australia? For a business-critical service, support that closes at 5pm EST or routes to an offshore call centre at 6pm is a genuine operational risk.

Contract terms: Month-to-month versus 12 or 24 month contracts. Month-to-month is available from most Australian cloud PBX providers and is strongly preferable unless the discount for a longer term is significant (20%+). You do not want to discover a provider's shortcomings and be locked in for 18 months.

Hardware compatibility: Does the provider support auto-provisioning for the phone models you plan to use? A provider that requires manual SIP configuration for each handset (rather than push-provisioning from a portal) adds meaningful setup time and ongoing maintenance burden.

Number porting process: How long does the provider say number porting takes? What is their process for complex ports (multi-number, 1300, or numbers currently on Telstra business bundles)? Ask specifically -- do not assume.

See our hosted VOIP provider comparison for a side-by-side breakdown of major Australian providers.

What to Avoid

New installs of on-premise PABX hardware. In NBN-served areas, the PSTN copper the system connects to has been or is being decommissioned. A new on-premise PABX installation in 2026 requires SIP trunking anyway -- at which point you are paying for on-premise hardware whose primary advantage (PSTN reliability) no longer exists.

Buying hardware before choosing a provider. SIP desk phones need to be provisioned to a specific provider's platform. Purchase hardware after you have confirmed provider compatibility and provisioning support.

Long lock-in contracts for cloud PBX. The market is competitive and month-to-month is available. A 24-month contract for a hosted PBX service is only worth accepting if the discount is material and you have done thorough due diligence on the provider.

Relying on your MSP's recommendation without independent comparison. Managed service providers often have preferred provider relationships that may or may not align with your interests. See our guide to what your MSP is not telling you about VOIP for specifics.

Staying on the ISP ATA service indefinitely. The green port ATA is a basic voice line, not a business phone system. If your business is growing, taking more calls, or employing people who also need phone access, the ISP ATA service will create operational problems well before the PSTN shutdown forces a change.

Non-profit organisations have access to the same hosted VOIP platforms as commercial businesses, but often qualify for NFP pricing tiers and free or subsidised software licences. Our guide to VOIP for non-profits in Australia covers the pricing options, grant-funded upgrade paths, and low-cost phone setups available to Australian charities and NFPs.

For businesses at the 20-employee mark specifically, we have a dedicated guide covering what a phone system for 20 employees in Australia actually needs: concurrent call capacity, hardware mix, key features at this team size, and what the system costs on a typical Australian hosted PBX plan.

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For a direct comparison of VOIP against keeping your current phone setup, see our guide to VOIP vs traditional phone for Australian business. For hardware recommendations once you have chosen a provider, see our best SIP desk phone guide.