Asterisk: The Open-Source Engine Behind Many PBX Systems
🔧 Asterisk is an open-source telephony framework, not a ready-to-use business phone system. First released in 1999 and now maintained by Sangoma Technologies, it is the underlying engine that powers many commercial and custom PBX deployments worldwide.
This page explains what Asterisk is, who it is designed for, and when a business should consider it vs. a managed Cloud PBX.
At a Glance
Criteria | Cloud PBX (Voxbi) | Asterisk | Winner |
Available in Luxembourg | Yes | Self-hosted | Voxbi |
Ready to use | Yes | No | Voxbi |
Technical skill required | None | High | Voxbi |
Setup time | Hours | Weeks to months | Voxbi |
Support included | Yes | Community only | Voxbi |
Flexibility / customisation | Standard | Unlimited | Asterisk |
Licensing cost | Monthly fee | Free (GPLv2) | Tie* |
*Asterisk's zero licence cost is offset by engineering and infrastructure expenses.
Detailed Comparison
Each panel covers one key difference between a managed Cloud PBX and Asterisk. Geographic scope opens first.
🗺️ Coverage and deployment geography
Voxbi is a managed Cloud PBX with infrastructure operated in Luxembourg and the Greater Region. Businesses get local phone numbers, PSTN connectivity, and compliance with local regulations out of the box.
Asterisk has no geographic footprint of its own. It can be self-hosted anywhere, but the business must arrange its own SIP trunking, local number assignment, and data residency. For Luxembourg-based businesses, this means sourcing those services separately.
🏗️ What Asterisk actually is
Asterisk is a software framework for building telephony applications. It runs on Linux and provides the core logic for call routing, voicemail, conferencing, and more. Think of it as the engine of a car: powerful, but not something most people interact with directly.
Businesses that use Asterisk typically hire a telephony engineer to build a custom system on top of it. The framework itself has no graphical interface and no support contract.
💶 Cost and total effort
Asterisk itself is free and licensed under GPLv2. However, the total cost of ownership is not zero. You need a Linux server, a telephony engineer to configure it, SIP trunking from a provider, and ongoing maintenance for security patches and updates.
For most small and medium businesses in Luxembourg, the engineering cost exceeds the licensing savings compared to a managed Cloud PBX service.
🔄 Asterisk vs. FreePBX
FreePBX is a web-based graphical interface built on top of Asterisk. It makes Asterisk significantly more accessible. You can configure extensions, ring groups, IVR menus, and voicemail through a browser rather than editing configuration files by hand.
If you are considering open-source telephony, FreePBX is a more realistic starting point than raw Asterisk. Even so, both still require self-hosting and technical oversight. See the FreePBX comparison page for a full breakdown.
☁️ Asterisk vs. managed Cloud PBX
A managed Cloud PBX handles infrastructure, maintenance, updates, and support on your behalf. There is no server to manage and no configuration files to edit. You pay a monthly fee per user and get a fully functional phone system from day one.
Asterisk offers maximum flexibility for businesses with specific technical requirements. Managed Cloud PBX offers speed, reliability, and predictable costs for businesses that want to focus on their work rather than their phone system.
Frequently Asked Questions
Can a small business in Luxembourg use Asterisk?
Technically yes, but practically it is not recommended. Asterisk requires a Linux server, telephony engineering expertise, and ongoing maintenance. Most small businesses in Luxembourg are better served by a managed Cloud PBX, which requires no technical knowledge and includes support.
Is Asterisk free?
The Asterisk software itself is free and open-source. However, running it requires server infrastructure, SIP trunking, and technical labour to configure and maintain. These costs often make it more expensive than a managed service for small teams.
What is the difference between Asterisk and FreePBX?
Asterisk is the underlying telephony engine. FreePBX is a graphical user interface built on top of Asterisk. FreePBX makes it easier to manage an Asterisk system without editing configuration files. Both require self-hosting and technical knowledge, but FreePBX lowers the barrier considerably.
Who maintains Asterisk?
Asterisk is maintained by Sangoma Technologies, which acquired Digium (the original creator of Asterisk) in 2018. The project is open-source and has an active developer community. Sangoma also sells commercial products based on the Asterisk framework.
When should a business consider Asterisk?
Consider Asterisk if you have in-house telephony engineering expertise, very specific call routing requirements that commercial products cannot meet, or you are building a custom communications platform. For standard business telephony, a managed Cloud PBX is a faster and lower-risk choice.
📅 Ready to explore Cloud PBX for your business?
Start with the provider comparisons or feature guides. If you want expert help, book a short call with a consultant.
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Further reading: Asterisk official documentation | Sangoma Technologies
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