Install and Configure 3CX PBX on Debian 10/9/8

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In this guide, we’ll cover the installation and configuration of 3CX on Debian 10/9/8 Linux distributions. This guide is a part of building an enterprise open source VOIP System on Linux. 3CX is an open standard software-based IP PBX system which offers complete Unified Communications for your Business.

By using 3CX, it becomes so easy to install, manage and maintain your PBX system, whether as a Cloud PBX or on a dedicated server on your premise. The recommended operating systems for running 3CX are Buster, Stretch or Jessie.

Install 3CX PBX on Debian 10/9/8

Note that 3CX provides both free and commercial versions of the software. For comparison, check 3CX Edition Comparison page.

Step 1: Update your system packages

Let’s make sure we have all packages updated.

sudo apt update
sudo apt upgrade -y

If you have Kernel updates, it is recommended to reboot your server before you continue with the installation.

[ -f /var/run/reboot-required ] && sudo reboot -f

Step 2: Add 3CX Repository to Debian 10/9/8

Next is to add the 3CX packages repository to your system. Start by importing GPG key used for signing packages.

wget -O- | sudo apt-key add -

Once the key is imported, add repository.

# Add repository to Debian 10
sudo apt install gnupg2 -y
echo "deb buster main" | sudo tee /etc/apt/sources.list.d/3cxpbx.list

# Add repository to Debian 9
sudo apt install gnupg2 -y
echo "deb stretch main" | sudo tee /etc/apt/sources.list.d/3cxpbx.list

# Add repository to Debian 8
sudo apt install gnupg2 -y
echo "deb jessie main" | sudo tee /etc/apt/sources.list.d/3cxpbx.list

Step 3: Install 3CX PBX on Debian 10/9/8

Update repository list and install 3CX.

sudo apt update
sudo apt install net-tools dphys-swapfile -y
sudo apt install 3cxpbx -y

This is a fully automated installation, you just relax and wait for it to complete. On success, a message is printed on your screen:

Created symlink /etc/systemd/system/ → /lib/systemd/system/3CXHotelModule01.service.

        _____ _______  __
       |__  // ____/ |/ /
        /_ 1

Starting PBX Web configuration tool..
Launch this URL from a browser on another machine:s
TIP: If this is a cloud machine and the link shows a local IP address then you need to replace the local IP with your public IP Address.

Processing triggers for systemd (241-7~deb10u8) ...
Processing triggers for libc-bin (2.28-10+deb10u1) ...

Step 4: Open 3CX Web interface

Now open  3CX Web portal using URL shown after the installation to finish the setup.

Get your free linux PBX license key from here: 

Once you get the license key, paste it on License key box and click “Next”


Next configurations are for:

  • Configure login username and password


  • Confirm your IP address or set new one
  • Select the type of Public IP
  • Select your preferred Subdomain/FQDN


  • Port selection for Web services (HTTPS/HTTP) and VoIP (SIP and Tunnel)


  • Select the default network adapter


Wait for domain setup to complete then:

  • Select Extension Length
  • Set Admin Email
  • Select Country and Time Zone
  • And all other settings asked


You’ll be required to Create Operator Extension which will be the default destination for inbound calls. Also confirm the Voice Mail extension that will allow users to retrieve their voice mail.

On completion, you’ll be shown installation details with “Congratulations Your 3CX Installation is ready” message. You can access the 3CX Management console from this URL: or via IP: https://ip-address:5001


You should get admin interface for Administering 3CX PBX system.


If you ever need to re-install 3CX, clean the installation first by running:

sudo /usr/sbin/3CXWizard --cleanup

Enjoy using 3CX!. Read more on 3CX documentation and check more articles on VoIP articles section.

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A systems engineer with excellent skills in systems administration, cloud computing, systems deployment, virtualization, containers, and a certified ethical hacker.