by pbx.lu Editorial on November 02, 2026
To test an internet connection in Luxembourg, start with CheckMyNet, the free tool from the Institut Luxembourgeois de Régulation (ILR). Run a wired test, keep the results and use another tool to investigate speed or stability. For business phone calls, also test the Cloud PBX itself: a fast download result does not guarantee clear audio.
This guide compares five free tools, explains a repeatable testing method and shows how to check business calling with Voxbi as an example.
Which free internet test should you use?
Choose the tool for the question you need to answer. Keep the same device and connection method when comparing results.
Tool | Use and limits |
Local regulator testing and result history. Browser: speed and ping. Apps add quality tests. | |
Speed and responsiveness. Compare idle ping with ping during downloads and uploads. | |
Speed and application experience. The desktop app also offers browsing and video tests. | |
Connection stability. Inspect latency under load, jitter and packet loss. | |
A quick initial check. Open ‘Show more info’ for upload and loaded/unloaded latency. |
Features differ between browsers and apps. Ookla explains its three ping measurements, while nPerf documents its desktop tests. FAST.com tests against Netflix servers; Cloudflare uses its own network. Different test paths and methods can produce different results.
CheckMyNet: browser or app?
ILR’s June 2026 report states that additional quality tests require the Android, iOS or desktop app for Windows, macOS or Linux. They are unavailable in the browser. Enable the relevant tests in the app settings.
How to run a reliable internet speed test
- Check the test equipment. Connect a computer directly to the router by Ethernet. Check that its network adapter and the router port support your subscription speed. A 1 Gbit/s port cannot demonstrate the full capacity of a faster service.
- Establish a quiet baseline. Pause backups, downloads, streaming and cloud synchronisation across the network. Record whether a VPN is active. If your IT policy permits, compare with the VPN disconnected.
- Run and save the test. Record the date, time, tool, server where shown, device, connection method, download, upload and ping. Keep screenshots or shareable results.
- Repeat consistently. Test in the morning, around midday and during your busiest period over several days. This is a practical diagnostic routine, not an official certification procedure.
- Compare real working conditions. After the baseline, repeat with typical office activity. Test Wi-Fi separately from the desks where staff work. A Wi-Fi test includes the wireless network as well as the internet path.
Run one speed test at a time. Tests generate traffic and may disrupt calls, so arrange busy-network checks with colleagues. On mobile connections, remember that repeated tests consume data.
What do the results mean for business calls?
Download and upload describe how much data the connection can carry. For voice over internet protocol (VoIP), also examine:
- Latency: delay. Speed-test ping measures a round trip to the test server; one-way voice delay measures travel in one direction along the voice path.
- Jitter: variation in packet delay. Uneven delivery can make speech break up.
- Packet loss: data packets that do not arrive. Missing voice data can cause gaps or distorted speech.
- Loaded latency: delay while the connection is carrying other traffic. Compare it with the idle result to see how responsiveness changes.
Cloudflare’s methodology explains these measurements and their limits. Results include the device, local network and route to its servers. They do not isolate the provider’s line or test every destination your business uses.
Use repeated patterns and actual symptoms to decide what to investigate. A national average ping is not a fault threshold. Two tools reporting low speed still cannot identify the faulty component on their own.
What internet connection does a Cloud PBX need?
A Cloud PBX is a hosted business phone system. It needs enough upload and download capacity for simultaneous calls, stable delivery and the network access required by the service.
AT&T’s bandwidth guidance uses about 100 kbit/s per active call in each direction as a starting point. Ten simultaneous calls would therefore need roughly 1 Mbit/s each way for voice alone. Allow extra capacity for other traffic and confirm the codec, which encodes the audio, and network overhead with your supplier.
For example, Voxbi’s call-quality guide recommends one-way latency below 150 ms, jitter below 30 ms and packet loss below 1%. These are planning targets for voice, not guarantees from a browser speed test. Your IT team should also check the service’s firewall requirements.
How to test Cloud PBX calls with Voxbi
Voxbi offers browser, desktop and mobile apps. With an authorised, configured account and external calling enabled, use the following practical test. Call charges and account conditions may apply.
- Start on Ethernet. Use the desktop app and a headset. Make an outbound call to a colleague on another network, then ask them to call back. Check that both sides hear clearly.
- Repeat during normal office activity. Use the number of simultaneous calls your business expects. Check for delays, missing words, robotic sound and dropped calls.
- Change one condition at a time. Repeat on office Wi-Fi. On the mobile app, select internet calling and compare Wi-Fi with mobile data, so the test uses the data connection.
- Keep useful fault details. Record call times, devices, connection types and symptoms. Share relevant call references privately with support. Ask whether call-quality diagnostics are available for your deployment.
This proposed procedure checks your configured service; it does not certify the whole connection. If calls fail despite good speed results, ask IT to check Voxbi’s published firewall requirements. Apply equivalent checks to another Cloud PBX.
What should you do if problems continue?
Compare repeated wired results with your contract. For fixed internet, ILR explains that contracts distinguish minimum, normally available, maximum and advertised speeds. A maximum figure alone does not describe what you should receive all the time.
Send your provider a written fault report with dated results and symptoms. For a business contract, follow its escalation process and any service-level agreement (SLA), which sets contractual service commitments. Test records support investigation; they do not automatically establish entitlement to a refund.
For consumer subscriptions, MyILR recommends allowing around two weeks for a proper written response. Eligible unresolved consumer disputes may go to ILR mediation. ILR’s telecom mediation is not the standard route for disputes between two businesses.
For your next phone-system decision, use the business phone features guide and Luxembourg provider directory to define what to evaluate. Keep connection measurements and real call tests together when assessing whether a service meets your needs.
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TLDR: How to test your internet in Luxembourg: free tools compared (2026)
- Start with CheckMyNet, the ILR regulator tool, then use Cloudflare to check jitter, packet loss and loaded latency.
- A fast speed test result does not guarantee clear Cloud PBX calls; check latency, jitter and packet loss separately.
- If calls fail despite good speed results, verify firewall settings with your Cloud PBX provider.
Updated on 2026-11-02