Calling Plans, Operator Connect or Direct Routing? Global guides say it depends. In Luxembourg, numbering, languages, 112 rules and DORA make the choice much clearer.
Most comparisons of Calling Plans, Operator Connect and Direct Routing are written for a global audience, and most of them end with the same line: it depends. For a company in Luxembourg, it depends a lot less than those guides suggest.
The country does things its own way. Phone numbers have no area codes, reception desks switch between four languages, and the regulator has its own rulebook for emergency calls. The financial sector is large and closely watched. And almost half of the people who work here live somewhere else: according to STATEC, 47% of employees in Luxembourg at the end of 2025 were cross-border workers.
The Number On Your Letterhead
Luxembourg’s numbering plan, managed by the ILR, has no area codes, and numbers vary in length. Many companies have used the same short base number for decades, with extensions behind it: -1 for reception, -25 for accounts. Clients know these numbers by heart.
Moving that setup to Microsoft Calling Plans is harder than it looks. Only geographic numbers can be ported to Microsoft in Luxembourg, toll-free numbers cannot be ported at all, and a port can take anywhere from 5 to 30 business days. Operator Connect avoids the port only if your current operator is on Microsoft’s list, and lines for alarms or lifts still have to live outside Teams. With Direct Routing, the whole block stays with your Luxembourg operator, toll-free lines included, and the operator looks after the dial rules for short, variable-length numbers.
Four Languages At Reception
Luxembourgish does not appear on Microsoft’s list of languages for Teams auto attendants. If your greeting and menu live in Teams, as they do with Calling Plans and Operator Connect, callers will not hear their own language unless you record every prompt yourself. With Direct Routing, the welcome message and language menu can run in the operator’s cloud PBX, in Luxembourgish, before the call is handed to the right person in Teams. For a customer calling from Esch, those first ten seconds say a lot about a company.
What Happens When Someone Dials 112
In July 2024, the ILR adopted Regulation T24/9, which sets out how precisely and reliably providers must locate people who call 112. VoIP services are covered too. Teams, however, only uses a caller’s live location in the United States and Canada. Everywhere else, whichever path you choose, it passes on the address registered for the user, which is usually the office.
A local operator running Direct Routing can at least route emergency calls correctly for each office site. For staff working from home in Thionville or Arlon, the safest advice is the same everywhere: dial 112 from a mobile.
A Question For The Risk Committee
Banks alone employed 26,575 people in Luxembourg in June 2026, according to the CSSF, and all of them fall under DORA. The regulation leaves only traditional analogue phone lines out of its definition of “ICT services”. Teams calling is not one of them, so it belongs in the register of ICT providers.
This is where the paths start to differ. A Calling Plan puts collaboration and telephony with the same supplier, and leaving later means a porting project. Operator Connect can add an aggregation platform to the chain. With Direct Routing, a separate local operator runs the telephony and the SBC, the numbers never leave, and external calls can be recorded in the operator’s network. The exit plan almost writes itself.
The Day Teams Goes Quiet
On 29 October 2025, a failure in Microsoft’s Azure Front Door service disrupted Microsoft 365, and Teams was among the services affected. With a Calling Plan, inbound calls depend on Microsoft being reachable. With Operator Connect, what happens next depends on the operator. With Direct Routing, the operator can see that Teams is unreachable and send calls to mobiles or another site. Run two SBCs in separate data centres and customers still get through.
So Which Path?
Calling Plans make sense for a handful of new, low-volume users. Operator Connect looks neat in the admin centre. But a Luxembourg company with a well-known main number, callers in several languages, staff across the border or a CSSF licence will find that Direct Routing is the only path that handles all five of these issues. The one thing to insist on is managed Microsoft Teams Direct Routing, where the operator, not your IT team, runs the SBC, the dial rules and the failover. Luxembourg operators such as Mixvoip offer it as a fully managed service, and Mixvoip has published a more detailed comparison of Direct Routing and Operator Connect.
About Mixvoip
Founded in 2008, Mixvoip is a telecom operator for businesses in Luxembourg, Belgium, France and Germany, and Luxembourg’s second-largest fixed-line telephony operator based on ILR market data. It provides managed Microsoft Teams Direct Routing in Luxembourg: Mixvoip runs the SBC, keeps your Luxembourg numbers and extension ranges, and connects Teams to its Voxbi cloud PBX, door phones, paging and call recording. More information: mixvoip.com