If your business is still running a traditional PBX system, you might be wondering whether it’s time to switch to something cloud-based like Microsoft Teams Phone. It’s a fair question — and it’s one we help SMEs answer all the time.

The short answer? For most growing Irish businesses, Teams Phone makes more sense today than it did five years ago. But “most” doesn’t mean “all,” so let’s walk through what each option actually does and when one beats the other.

What’s the Difference?

A traditional PBX (Private Branch Exchange) is a physical box that sits in your office. It routes calls between your staff, manages hold queues, transfers, and voicemail. You own it, you maintain it, and you pay for it upfront — often €5,000–€15,000 depending on size and features.

Microsoft Teams Phone is software. Your calls run through the internet using your Microsoft 365 subscription and your existing broadband connection. There’s no box to buy, no on-site hardware to maintain, and you scale up or down by adding or removing user licenses (around €8–€12 per user per month).

The Practical Advantages of Teams Phone

Flexibility and mobility — Your staff can answer work calls from anywhere with an internet connection: home, a client site, or a coffee shop. That’s become table stakes in 2026.

Integration with your tools — Teams Phone sits inside Microsoft 365, so call history, contacts, and notes sync automatically with Outlook and other apps you’re already using. No separate system to log into.

Lower upfront cost — You’re not buying expensive hardware. Just add licenses to your existing subscription.

Easier scaling — Need to add five new team members? Add five licenses. With a PBX, you might need to upgrade the system itself.

Disaster recovery built in — If your office internet goes down, calls can route to mobile phones automatically. A physical PBX can’t do that.

When a Traditional PBX Still Wins

Let’s be honest: there are scenarios where a PBX still makes sense.

Very poor broadband — If your office internet is unreliable or slow, Teams Phone will struggle. But if that’s your situation, it’s probably worth fixing your connectivity anyway.

Specialized needs — Some businesses (certain call centres, for example) have advanced telephony requirements that Teams Phone doesn’t handle yet.

Long-term cost predictability — With a PBX, once it’s paid off, your phone costs are minimal. Teams Phone is a monthly expense that grows with headcount.

Making the Switch

If you’re leaning toward Teams Phone, the migration is straightforward. You keep your existing phone number, set up Teams Phone licenses, configure call routing, and test before you cut over. Most SMEs we work with do this over a weekend with minimal disruption.

One important note for Irish businesses: if you’re handling customer data, make sure your phone recordings comply with GDPR guidelines set by the Data Protection Commission. Both PBX and Teams Phone can do this, but you need to set it up correctly.

The Bottom Line

Teams Phone wins on flexibility, cost, and modern working practices. A traditional PBX wins on familiarity and, sometimes, on total cost of ownership over 5+ years. For most Dublin and Irish SMEs, especially those growing or adopting hybrid working, Teams Phone is the smarter bet today.

The best choice depends on your broadband quality, your growth plans, and how much you value the integration with the rest of your Microsoft tools. Take an honest look at those three factors, and the answer usually becomes clear.