Luxembourg is among Europe's best-connected business markets, and its phone systems have followed. Fibre reaches most premises, copper is nearly retired, and one business number now follows your team across desk, mobile, laptop, and Microsoft Teams. The 2026 question isn't whether to move to cloud, but which provider does it best and why Mixvoip’s Voxbi wins for most SMEs.
How business telephony in Luxembourg is changing
The shift to cloud telephony is not a hunch. It is in the regulator's own numbers. In its 2025 report, published in June 2026, the ILR shows that in a single year:
- business fixed telephone connections fell from 45,300 to 40,700;
- outgoing business call minutes dropped from 149.9 million to 133 million;
- legacy analogue and ISDN business lines collapsed by 62.4 percent, to just 6,900;
- business lines running over the internet (Voice over Broadband) grew 25.6 percent, to 33,700.
This does not mean customers have stopped calling companies. It means the calls are moving. Add the near-complete switch-off of the old copper network, with only about 15,500 analogue lines left nationally, and the direction is clear: communication is shifting to mobiles, Microsoft Teams, internet apps, and IP-based phone systems.
So for a company reviewing its setup in 2026, the useful question is no longer "which provider sells phone lines?" It is this: which provider can manage calls consistently across offices, mobiles, computers, Teams, and customer-service workflows? The rest of this guide answers exactly that. (The full ILR report is here)
Whats is a cloud PBX?
You will find many time "cloud PBX" in this article, but what does it really means before we compare providers?
A PBX (Private Branch Exchange) is simply a company's phone system. It gives a business one main number, rings the right person or department, plays the "press 1 for sales, press 2 for support" menu, holds callers in a queue, and takes messages after hours. For decades this was a physical box in a cupboard, wired to every desk phone.
A cloud PBX does the same job without the box. The phone system runs as software in a secure data centre and reaches your team over the internet. There is nothing to install on a wall and nothing to maintain, updates arrive on their own, and the same business number works on a desk phone, a computer, or a mobile, wherever people happen to be.
Most people already know Microsoft Teams, Zoom, or Webex, so this is the comparison that tends to cause confusion. The short answer is that they do a different job.
Teams, Zoom, and Webex are collaboration tools. They are built for video meetings, screen sharing, and internal chat between colleagues who each have an account and the app open. A cloud PBX is a business phone system. It is built for the public telephone network: real calls to and from anyone with a phone, on a proper Luxembourg number, whether or not the other person uses any app. It handles what a front desk needs, such as call menus, queues, opening hours, and call recording.
In practice the two sit side by side, and many companies run both: the collaboration tool for meetings and internal chat, the cloud PBX for the calls that reach customers and suppliers. Teams, Zoom, and Webex now each sell a paid calling add-on (Teams Phone, Zoom Phone, and Webex Calling), but to make and receive ordinary calls on a local number you still need a licensed operator to connect them to the phone network, port your existing numbers, and handle emergency calls. That connection is what a cloud PBX provides, and a capable one can sit behind Microsoft Teams and turn it into your business phone.
What makes a cloud PBX the best
Offers look alike on paper. The differences appear on a normal working day, across five things:
- One number on every device. The same business number on a desk phone, desktop app, browser, or mobile, with one feature set and in several languages. The independent cloud PBX guide on pbx.lu explains how each piece fits.
- Routing that mirrors how you work. By opening hours, department, caller language, availability, office, and overflow, not just ringing every phone at once.
- Pricing you can total before calling sales. Numbers, calls, apps, recording, setup, porting, and contract length all count. It pays to work out the true cost over three to five years.
- Independence from your internet contract. A platform that runs over any connection lets you change ISP without rebuilding your phone system.
- A migration plan that survives a real cutover. Numbers, timing, emergency calling, and fallback all documented. A migration checklist helps avoid the obvious mistakes.
Why Voxbi comes out on top
For companies of roughly 5 to 250 people, Voxbi wins on things you can check for yourself, and on what they mean day to day.
It is the only product here with a complete public rate card, so you can work out your price before anyone calls you back. Your team uses one app on whatever they have to hand: a browser tab, a Windows or Mac desktop, an iPhone or Android, all with the same features. In practice that means people can use Microsoft Teams as their phone, calls route through proper menus and queues, conversations get recorded the way the regulator expects (MiFID and PFS), and the system plugs into the tools you already run, like Microsoft 365 and Odoo. Because it runs over any business internet, your phone system survives a change of provider, and because Mixvoip is a licensed operator in Luxembourg, Belgium, France, and Germany, one account can give your staff local numbers in all four countries.
There is weight behind it, too. Mixvoip is Luxembourg's second-largest fixed-line operator and serves more than 5,000 businesses, including many of the country's municipalities and care homes. The product is built and hosted in Europe and is ISO/IEC 27001 certified. You do not have to take any of this on trust: the pricing, the features, and the certification are all published.
What Voxbi costs
All prices exclude VAT.
Paid plans do not include a number (the free tier includes two), extra numbers start at €1.60, calls are per minute to more than 140 destinations, and Teams is a €50 per month add-on on Pro and above. Even so, you can build a full estimate from public information, which is rare in this market.
What does that mean for a real team? Take 25 people on the Pro plan: that is €72.50 a month for the seats (25 at €2.90, excluding VAT). Add the phone numbers you need (from €1.60 each), per-minute calls, and Microsoft Teams if you want it (€50 a month). A typical 25-seat setup lands somewhere around €110 to €165 a month before call usage, and you can model the whole thing yourself from the public page before you speak to anyone.
What switching actually involves
The honest worry with any phone change is disruption, so here is what to expect with Voxbi.
- You keep your numbers. Porting follows the ILR's regulated process: about one working day in law, and roughly five working days end to end in practice.
- You usually keep your phones. Voxbi certifies and reconfigures mainstream SIP handsets (Yealink, Fanvil, Grandstream, Snom, Gigaset DECT, and others), so most businesses reuse what they have instead of buying new hardware.
- Calls survive an outage. If a line goes down, a patented mobile fallback keeps calls flowing independent of your internet and data, with 4G, 5G, or satellite backup available.
- Support is local. A Luxembourg-based, multilingual team handles support, with service levels written into your plan rather than a call centre in another time zone.
You make day-to-day changes yourself through the Voxbi web admin or let the Mixvoip team co-manage. Commitments are shorter than the 24-to-36-month contracts common elsewhere in this market.
AI call handling
In mid-2026 Mixvoip launched a partnership with Elora, a Luxembourg startup whose conversational AI call agents plug into Voxbi over SIP. The agent answers during a rush or after hours, understands the caller in several languages, takes a structured message, qualifies the request, and either creates a ticket or transfers the call. It is not there to replace your reception, but to stop you losing the call you would otherwise miss. Test it on your own call patterns, then let it earn its place.
Who Voxbi is best for
Voxbi fits best when a business wants public pricing it can model, a modern softphone as the main way people work, documented Teams calling and call routing, local numbers across Luxembourg, Belgium, France, and Germany, the freedom to keep its own ISP, and enterprise features without enterprise procurement. That covers most of Luxembourg's small and mid-sized firms. A few buyers reasonably weight other factors (an organisation needing end-to-end PFS status may prefer DEEP), so compare your shortlist on the same requirements, which is what a neutral comparison on pbx.lu is built for.
The verdict for 2026
Luxembourg's move to cloud telephony is effectively complete, and the infrastructure is already in place. That turns the choice into a strategic one: which provider gives you the system that makes your company easiest to reach. Weighed on price you can see for yourself, a phone that works on every device, and switching and support that do not disrupt you, Voxbi is the best cloud PBX provider in Luxembourg for 2026 for most small and mid-sized companies.
Write down your users, numbers, call flows, languages, and integrations, then ask each shortlisted provider to handle a normal working day. The system that handles your real Tuesday, not the one that looks best in a quotation, is the one to choose. For most companies in the Grand Duchy, that is Voxbi.
Learn more about Voxbi: mixvoip.com/voxbi
