Microsoft Teams Calling vs 3CX: A 2026 comparison for Australian businesses

If you’re on Microsoft 365 and someone told you “just add Teams Phone, it’s the cheapest option” - they were half right. Teams Phone is cheap for the first 10 users. After that, it gets expensive, and you start hitting feature walls that Microsoft doesn’t have a roadmap to break through.

The smart play for most Australian businesses already on M365 is to keep Microsoft Teams as the calling client your team already uses, but move the PBX backend to 3CX via Direct Routing. You get Teams’ collaboration plus 3CX-grade telephony, on the same numbers, at a fraction of the cost.

The price math

Microsoft Teams Calling has two flavours:

• Teams Phone Standard - AUD ~$14/user/month - adds calling capability to Teams; you bring the calling plan via Calling Plans, Operator Connect or Direct Routing.
• Teams Phone with Calling Plan - AUD ~$24/user/month - bundles a Microsoft-managed Australian calling plan.

For a 50-user business:

At 50 users Teams Calling already costs more than most CPS-managed 3CX bundles. At 100 users the gap doubles. At 200, double again. Teams Calling’s per-user pricing is linear and unforgiving - 3CX is essentially flat once you’ve bought the system tier.

What you give up with Teams Calling

Teams Calling has the basics of telephony - dial pad, hold, transfer, voicemail, basic queues. What it doesn’t have:

• Advanced call queues - skills-based routing, priority queues, callback option, SLA alerts. Teams’ “Call Queues” are basic round-robin or longest-idle.
• Real-time wallboards - Teams admin shows historical data; for live floor-display you need third-party tools.
• Supervisor listen/whisper/barge - limited in Teams; available in 3CX PRO.
• Scheduled reports - Teams admin centre is for IT; managers don’t get daily/weekly email reports.
• AI Receptionist - Microsoft’s Copilot adds some AI features but no equivalent to 3CX’s OpenAI-powered AI Receptionist that answers, screens and routes calls in 50+ languages 24/7.
• AI sentiment tracking - Microsoft has this on its roadmap for Contact Center; 3CX has it shipping in AI Edition today.
• Deep CRM integration beyond M365 - Teams Calling integrates well with Dynamics; less so with HubSpot, Salesforce, Zoho, Pipedrive. 3CX integrates with all of them out of the box.
• Choice of SIP trunk - Teams Calling forces Microsoft Calling Plans, Operator Connect, or specific Direct Routing carrier partners. 3CX uses any compatible SIP trunk; we bundle a competitive Australian plan.

For businesses where the phone system is just “make and take calls”, Teams Calling works. For businesses with reception queues, sales teams, contact-centre needs, AI ambitions or CRM integration requirements, you’ll hit a wall.

How 3CX Direct Routing works

Direct Routing is Microsoft’s official mechanism for connecting Teams to third-party PBXs. The setup:

Caller dials your business number
   ↓
SIP trunk routes call to 3CX PBX (in Australian data centre)
   ↓
3CX handles queues, IVR, recording, AI, reporting
   ↓
Direct Routing connects 3CX to your M365 tenant
   ↓
Teams user's phone rings (mobile, desktop, web Teams app)

The user makes and takes the call in Teams. The PBX intelligence (queues, recording, AI, reporting) happens in 3CX behind the scenes. Admins manage the PBX in the 3CX console; users do nothing different.

Implementation effort

Direct Routing is more involved than “just add Teams Phone” - but not by much, and it’s a one-time setup. Standard deployment:

• Configure Microsoft 365 Direct Routing in your tenant
• Install TLS certificates for the SBC
• Provision a Session Border Controller (SBC) - managed by us, in our Australian data centre
• Port your phone numbers from current carrier
• Configure 3CX queues, IVR, recording, integrations
• Assign users in M365 to use Direct Routing

Typical timeline 10–15 business days for a 50-user business. We handle the technical work end-to-end.

Migration guide: Microsoft Teams Calling → 3CX Direct Routing →

When Teams Calling is the right choice

Three scenarios where Teams Calling is actually fine:

1. Under-5-user business - Microsoft Teams Phone with Calling Plan at $24/user/month for 4 users is ~$1,150/year. The fixed cost of a 3CX setup makes Teams Calling cheaper at this size.
2. No PBX requirements - if you genuinely don’t need queues, contact-centre features, AI, or CRM integration beyond basic Microsoft 365 contacts, Teams Calling covers the basics.
3. Heavy Dynamics 365 / SharePoint workflows - if your business is built on the Microsoft stack and you don’t want any non-Microsoft component, the operational simplicity may be worth the higher cost.

For everyone else - and that’s most Australian 10+ user businesses - 3CX Direct Routing wins on cost, features, and flexibility.

Real switch example

A 75-person Sydney professional services firm we migrated last year:

Before: Teams Phone with Calling Plan ($24/user/month × 75 = $21,600/year). Plus Microsoft Calling Plan minutes overage. Plus a third-party wallboard tool for managing the inbound enquiry queue.

After: 3CX PRO with Direct Routing. Teams stays the calling client (no user-facing change). 3CX handles inbound queue with skills-based routing and AI voicemail transcription. CPS bundle includes Australian calling, hosting and support.

Outcome: customer reported the phone bill dropped by roughly two-thirds versus their previous Teams Calling spend. Wallboard tool cancelled (3CX has it built in). Support is now Australian-based and same-day-responsive.

Frequently asked