UCaaS vs Hosted PBX: Which Does Your Business Actually Need?

For most Australian small businesses, cloud phone system is the right choice and UCaaS is oversized (see our hosted PBX for small business guide if that is likely you). This comparison breaks down what UCaaS and cloud phone system actually deliver, what each costs at Australian market rates, and the specific criteria that determine which one fits your business. The short version: A standalone cloud phone system may cost less, but the difference depends on call inclusions, licensing, usage and whether the business already pays for Microsoft Teams or Microsoft 365.

Quick Verdict

What Is cloud phone system?

The risk of choosing UCaaS when you only need a phone system is paying $40 to $50 per user per month for features nobody uses. For a 10-person business, that is $1,500 to $3,000 per year more than a standalone cloud phone system. If your team is not already using video conferencing, team messaging, or file sharing as part of their daily workflow, UCaaS is overhead, not value.

A common concern when choosing a cloud phone system over UCaaS is whether you can add video conferencing later if you need it. You can. Video calls are a separate product from your phone system. Tools like Google Meet, Zoom, and Microsoft Teams (for video only, without the phone add-on) are free or low-cost and work independently of your cloud phone system. You do not need to bundle them into one expensive platform to get both.

cloud phone system is a phone system delivered as a cloud service. Your business phone company runs the PBX (Private Branch Exchange) software on their infrastructure, and your business connects to it over the internet. You get all the standard PBX features: call routing, auto-attendant, ring groups, voicemail, hold music, call transfer, and conference calling. You do not own or manage any phone infrastructure beyond the handsets your staff use.Pricing is almost always per seat per month, where each seat is one user extension. The provider handles all technical infrastructure: routing, failover, software updates, and reliability. You manage call routing rules and user accounts through a web portal. For a full breakdown of what cloud phone system includes and which providers are available in Australia, see our guide to cloud PBX in Australia.

What Is UCaaS?

UCaaS stands for Unified Communications as a Service. It combines voice calling with other communication channels: video conferencing, instant messaging, file sharing, and team collaboration, into a single cloud platform. The most familiar example in the Australian market is Microsoft Teams Phone, which adds external calling capability to the Microsoft Teams platform that many businesses already use for internal communication.UCaaS is designed for organisations where voice, video, and messaging workflows are tightly integrated. A staff member can start a chat, escalate to a video call, share their screen, and transfer to an external phone call without leaving the platform. This integration is genuinely useful in some contexts, but only for businesses where those specific workflows exist and where staff actually use all three channels.The pricing difference between UCaaS and cloud phone system reflects the breadth of what UCaaS delivers. A cloud phone system plan from an Australian specialist provider might cost $25 per seat per month for a complete phone system. Microsoft currently lists Teams Phone with pay-as-you-go calling at AU$19.50, domestic calling at AU$32.90, and domestic and international calling at AU$50.90 per user per month, paid yearly and excluding GST; a separate Teams licence is required. Current Australian RingCentral and 8x8 pricing is quote-based, so obtain like-for-like quotes before comparing them with Microsoft Teams Phone or hosted PBX plans. The premium is real and is only justified if you actually use the broader collaboration features.

Feature and Cost Comparison

The Real Cost for Australian Businesses

The cost gap between cloud phone system and UCaaS is material at SMB scale. A 10-seat business on a quality Australian cloud phone system plan might pay $25 per seat per month, totalling $250 per month for a fully featured phone system. At Microsoft’s current annual list prices, Teams Phone with domestic calling at AU$32.90 plus Microsoft 365 Business Standard at AU$21.00 totals AU$53.90 per user per month excluding GST, or AU$539 per month for 10 users.At current list prices, the 10-user Microsoft configuration totals AU$539 per month excluding GST. Teams chat and meetings come from the Teams or Microsoft 365 licence, while the Teams Phone bundle adds PBX and PSTN calling. If your business already pays for Microsoft 365 and already uses Teams for internal communication, the marginal cost of adding Teams Phone is much more reasonable. If you are paying for Teams Phone primarily to get a phone system and are not using the rest of the Microsoft platform, you are paying a significant premium for unused features.For Australian businesses focused on cost efficiency and primarily needing reliable voice communications, see our full breakdown of the VOIP cost landscape in Australia. Specialist AU cloud phone system companies consistently undercut UCaaS platforms at small to medium scale.

Microsoft Teams: The UCaaS Platform Most AU Businesses Already Have

For businesses that already use Microsoft Teams, adding calling capability can provide a path to a broader unified communications platform. Many Australian SMBs use Teams daily for internal chat and video calls. Adding external calling capability converts Teams from an internal tool into a full business phone system.The advantage is consolidation: one platform for calls, meetings, and messaging. The disadvantage is cost and complexity. Microsoft's calling plans for Australia are priced at the enterprise tier. The licensing structure (Teams Phone with Calling Plan bundle, Teams Phone Standard, Calling Plans versus Direct Routing) is genuinely confusing and often results in businesses paying more than necessary for the outcome they want.For a detailed breakdown of the Teams path, see our comparison of Teams Phone vs cloud phone system in Australia and our guide to Microsoft Teams Phone for Australian businesses.

When UCaaS Is Worth It

You are already on Microsoft 365 and your team actively uses Teams. If staff are in Teams all day for meetings and chat, adding external calling through Teams Phone creates genuine workflow efficiency. The marginal cost of adding calling to an existing Teams environment may be lower or higher than a separate phone system, depending on the PSTN option, call volume, inclusions and provider pricing. The integration benefit is real.You need tight CRM or business application integration. UCaaS platforms, particularly Microsoft Teams and Webex Calling, offer native integrations with Salesforce, Dynamics 365, and ServiceNow. If your sales or support team needs calls to log automatically in the CRM, or needs click-to-call from within a customer record, UCaaS platforms deliver this better than most cloud phone system options.You have a larger team and complex collaboration requirements. UCaaS may be worthwhile when negotiated pricing and actual use of its voice, video, and messaging features justify the additional per-seat cost.You have a distributed team that needs integrated presence across voice, video, and messaging. Multi-site businesses with significant remote work, where staff move fluidly between call, video, and messaging, benefit from UCaaS's integrated approach. A staff member who is always visible as available or in a call across all channels reduces the coordination overhead of separate tools.

When cloud phone system Is the Smarter Choice

You have between 1 and 20 seats and primarily need reliable inbound and outbound calls. For a medical practice, a law firm, a trades business, or a retail operation, the phone system exists to take and make calls. Video conferencing, if needed at all, can be handled by a free tool. There is no justification for paying UCaaS rates for this use case.You are not on Microsoft 365 and do not plan to be. If your business uses Google Workspace or another productivity suite, Teams Phone is not a natural fit and the integration benefits do not apply. A specialist Australian cloud phone system company is a simpler and cheaper option.You want local Australian support. Global UCaaS platforms have global, often offshore, support. Specialist Australian cloud phone system companies typically offer local support teams who understand AU-specific concerns: NBN call quality issues, number porting timelines, and ACMA regulatory requirements. Our guide to the best cloud phone system companies in Australia covers providers with strong local support.You want a predictable, simple monthly bill. Cloud phone pricing may be bundled or component-based; compare user and device licences, numbers, call plans, usage charges and add-ons in the total monthly cost. Many businesses discover their UCaaS bill is higher than expected once all the components are added together.

NBN Considerations for UCaaS vs cloud phone system

Both cloud phone system and UCaaS run over your internet connection, but their NBN requirements differ. cloud phone system is voice-only: each simultaneous call uses approximately 80 to 100 kbps of upload bandwidth. A 10-seat business with three to four concurrent calls needs around 400 kbps of upload. Most standard NBN connections handle this without difficulty.UCaaS adds video conferencing to the bandwidth load. Microsoft’s current guidance is per endpoint: Teams video meetings require about 150/200 kbps upload/download at minimum, 2,500/4,000 kbps recommended, and 4,000/4,000 kbps for best performance. If a significant portion of your team is on Teams video calls simultaneously, your NBN upload speed becomes the constraint. On NBN FTTN (Fibre to the Node) or Fixed Wireless connections with limited upload speeds, Simultaneous video sessions can add substantially more bandwidth demand than voice-only calling, increasing congestion risk on limited uploads; voice-only systems use less bandwidth but remain vulnerable to internet-quality problems.

ⓘ

If your business is on NBN FTTN or Fixed Wireless, check your upload speed before committing to a UCaaS platform. Use our VOIP Bandwidth Calculator to estimate how many concurrent calls and video sessions your connection can support.

For businesses already using Microsoft Teams that want phone calls integrated without the full UCaaS cost, Teams Direct Routing via an AU SIP trunk provider is a middle-ground option worth evaluating. It uses Teams as the unified communications layer while routing external calls through a competitively priced AU SIP trunk, bypassing Microsoft's Calling Plan pricing. Each user needs a Teams Phone licence (approximately $10 to $15 AUD per month), plus AU SIP trunk costs -- with actual savings varying by carrier, service design, call destinations, usage, support and implementation costs. It is not a simple initial setup and Direct Routing requires supported SBC infrastructure, which may be managed by the business, an integrator or a Direct-Routing-as-a-Service provider; Microsoft supports Direct Routing only with certified SBCs. For businesses with 20 or more seats already committed to Teams, Direct Routing is a worthwhile cost comparison before signing a UCaaS or hosted PBX contract.

What Most Businesses Get Wrong

Mistake 1: Choosing Teams Phone because the team already uses Teams for chat. Using Teams for internal messaging and using Teams as your external phone system are different propositions with different costs. Many businesses sign up for Teams Phone as a natural extension of their existing Teams use, then find the calling plan costs more than a standalone cloud phone system and introduces call quality problems they did not have before.Mistake 2: Paying UCaaS prices for a cloud phone system use case. If your team answers calls, transfers them, and makes outbound calls and nothing else, you are paying a substantial premium for video and messaging features that go unused. The justification for UCaaS has to come from actual feature use, not theoretical integration value.Mistake 3: Not comparing Australian specialist providers alongside UCaaS platforms. The marketing spend behind Teams Phone and RingCentral is significant. Smaller Australian cloud phone system companies do not have equivalent marketing reach, but whether they offer comparable call quality, stronger local support, or lower prices for an SMB depends on the provider, plan, and business requirements. Compare the full range of options before defaulting to the most advertised product. See our guide to the best VOIP phone systems in Australia for a shortlist of proven Australian providers.Mistake 4: Assuming UCaaS is more reliable because it is a bigger brand. Call reliability depends on your internet connection, your provider's infrastructure, and your phone system configuration. Brand size alone does not establish reliability; comparisons should consider each provider's infrastructure, service commitments, operational performance, configuration, and support arrangements. In many cases, local infrastructure and local support deliver faster resolution when something goes wrong.

Your Next Steps

1. Define your actual feature requirements. List what your team needs the phone system to do. If the list is calls, routing, voicemail, and possibly conferencing, that is cloud phone system territory. If it includes integrated video, messaging, and CRM in one platform, evaluate UCaaS.
2. Check your Microsoft 365 status. If you already pay for Microsoft 365 Business Standard or above, calculate the marginal cost of adding Teams Phone versus signing up with a standalone cloud phone system company. The answer depends on your specific licensing.
3. Get quotes from both categories. Contact one or two Australian cloud phone system companies alongside a Teams Phone or UCaaS quote. Compare the all-in monthly cost per seat including any underlying productivity suite costs.
4. Check your NBN connection type and upload speed. If you are on FTTN or Fixed Wireless with limited upload, factor in that UCaaS video at scale may create quality issues that cloud phone system avoids.
5. Evaluate local support availability. For a business phone system, local support matters when something goes wrong outside business hours. Confirm whether your preferred provider offers Australian-based support during AU business hours.

The UCaaS vs hosted PBX decision sits within the broader context of moving from traditional telephony to internet-based communications. Our guide to cloud phone systems vs traditional phones for Australian businesses covers the foundational comparison, including cost differences, NBN reliability considerations, and what the transition looks like in practice.

Is Microsoft Teams Phone the same as a cloud phone system?

Not exactly. Teams Phone is a cloud-based phone-system add-on native to Microsoft Teams; when combined with Teams chat, meetings and PSTN connectivity, the overall deployment can provide UCaaS. It integrates external calling with the broader Teams platform for chat, meetings, and collaboration. Some cloud phone systems focus on voice, while others integrate messaging and video; the included channels depend on the provider and plan. Teams Phone can function as a phone system, but it carries the cost and overhead of the full UCaaS stack whether you use those features or not.

Can I use a desk phone with UCaaS?

Yes. Most UCaaS platforms support physical desk phones from vendors like Yealink and Poly, but UCaaS platforms support specified compatible desk phones; certified native phones generally provide the fullest feature and management support, while some platforms also permit compatible or generic SIP devices with limitations. Teams-compatible phones for Microsoft Teams Phone, for example, have a dedicated Teams button and tight platform integration. Non-certified SIP phones may work in limited modes but lose platform-specific features. See our guide to the best business desk phones in Australia for compatible hardware options.

Is UCaaS better for remote teams than cloud phone system?

UCaaS has an advantage for remote teams if those teams genuinely benefit from integrated voice, video, and messaging in one platform. If your remote team takes and makes calls but uses a separate free tool for video, cloud phone system with a softphone app achieves the same outcome at lower cost. The integration benefit of UCaaS only materialises when the team uses all channels on the same platform consistently.

What does UCaaS cost per user in Australia?

Microsoft currently lists Teams Phone with pay-as-you-go calling at AU$19.50, domestic calling at AU$32.90, and domestic and international calling at AU$50.90 per user per month, paid yearly and excluding GST; a separate Teams licence is required. Australian hosted-PBX pricing may be bundled or itemised and can include separate usage and add-on charges.

Can I switch from UCaaS back to cloud phone system if I change my mind?

Australian numbers are generally portable in either direction, but the gaining provider does not have to accept every port, and eligibility and timing vary by number type, complexity and provider process. Confirm portability before committing. The practical consideration is any contractual commitment to the UCaaS platform. Check your contract terms before signing up for a UCaaS product.

Do Australian cloud phone system companies offer video conferencing?

Most Australian cloud phone system companies do not offer in-platform video conferencing as a core feature. Some offer integrations with third-party tools. For businesses that need video, the typical approach is a cloud phone system for calls combined with a free or low-cost video tool such as Google Meet or Zoom. Depending on providers, plans, usage and existing software licences, this combination may be cheaper than a full UCaaS platform.

Not sure whether your business needs cloud phone system or a UCaaS platform? We match Australian businesses with the right phone system for their actual requirements and budget.

Get a free recommendation

Not sure whether UCaaS or a cloud phone system is right for your team's specific workflow? Tell us how many staff need phones, whether they already use Teams or Zoom, and what your main communication challenge is. We'll give you a specific recommendation. We reply personally, usually within one business day.

Every business is different. Tell us your current setup and what you are trying to achieve. We reply personally, usually within one business day.

Ask a Question