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Download 3CX ISO and Get Started with 3CX in No Time

How to Download and Install 3CX ISO

If you are looking for a reliable, flexible, and cost-effective business phone system, you might want to consider using . It is a cloud-based or on-premise PBX solution that uses Internet Protocol (IP) to transmit voice, video, chat, and other communications. It offers many features and benefits that can help you improve your customer service, team collaboration, productivity, and scalability.

In this article, we will show you how to download and install the latest version of . We will cover both the Debian and Windows installation methods, as well as the system requirements and configuration steps. By the end of this article, you will be able to set up your own IP PBX system using 3CX.

download 3cx iso

What is 3CX and why use it?

3CX is a complete unified communications solution that allows you to make or receive phone calls, send or receive messages, host or join video conferences, chat with your website visitors, integrate with your CRM or other applications, and much more. It supports a wide range of devices, including IP phones, softphones, web clients, mobile apps, and SIP trunks. It also supports various deployment options, such as hosted by , self-hosted on your own cloud provider or on-premise.

Some of the main advantages of using are:

  • It is affordable and scalable. You can choose from different license editions based on your needs and budget. You can also save up to 80% on your phone bills by using SIP trunks and eliminating interoffice calls.

  • It is open platform and flexible. You can choose your own phone numbers, SIP trunk providers, cloud providers, hardware devices, and integrations. You can also switch between hosted or self-managed at any time.

  • It is easy to manage and maintain. You can install and configure it in minutes using a web-based management console. You can also automate updates, backups, security patches, and monitoring.

  • It is mobile and remote-friendly. You can use your office number to make or receive calls from anywhere using your smartphone or laptop. You can also access all the features of from any device using a web browser.

  • It is feature-rich and powerful. You can use app-free video conferencing for up to 250 participants, live chat with your customers using WhatsApp or Facebook Messenger, advanced call center features like call queues, IVR, reporting, agent training tools, etc.

What is an ISO file and how to download it?

An An ISO file is a type of disk image file that contains the entire contents of a CD or DVD. It can be used to create a bootable media that can run an operating system or a software application. You can download the latest version of 3CX ISO from the official . The file size is about 1.5 GB and it includes both the Debian Linux operating system and the 3CX PBX software. You will need a USB flash drive or a DVD to burn the ISO file and use it for installation. Installing 3CX on Debian from ISO

If you want to install 3CX on Debian Linux, you can use the ISO file to create a bootable media and follow these steps:

Step 1: Check system requirements

Before you start the installation, make sure that your system meets the minimum requirements for running 3CX on Debian. These are:

  • A dedicated machine or virtual machine with at least 2 GB of RAM and 32 GB of disk space.

  • A static IP address for your server.

  • A valid FQDN (Fully Qualified Domain Name) for your server.

  • A valid SSL certificate for your FQDN (you can use a free Let's Encrypt certificate).

  • A supported SIP trunk provider or VoIP gateway for making and receiving calls.

Step 2: Install Debian for 3CX

Once you have downloaded the ISO file, you need to burn it to a USB flash drive or a DVD using a tool like . Then, you need to boot your system from the USB or DVD and follow the on-screen instructions to install Debian for 3CX. The installation process is straightforward and automated, and it will take about 15 minutes to complete. You will be asked to choose your language, keyboard layout, time zone, hostname, domain name, root password, and network settings. You will also be asked to confirm the installation of 3CX and accept the license agreement.

Step 3: Upload the configuration file

After the installation is finished, you will see a message on your screen with a URL and a QR code. You need to visit this URL from another device (such as your smartphone or laptop) and upload the configuration file that you received from 3CX when you signed up for a license. This file contains your license key and other settings for your PBX system. You can also scan the QR code with your smartphone camera and upload the file from there. Once you upload the file, your PBX system will be activated and ready to use.

Step 4: Configure split DNS

Split DNS is a technique that allows you to use the same domain name for both internal and external access to your PBX system. This way, you can avoid NAT issues and ensure that your calls are routed correctly. To configure split DNS, you need to do two things:

  • Create an A record in your external DNS server that points your FQDN to your public IP address.

  • Create an A record in your internal DNS server that points your FQDN to your private IP address.

For example, if your FQDN is and your public IP address is and your private IP address is, you need to create these records:

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DNS ServerRecord TypeNameValue



You can use tools like to verify that your records are working correctly.

Step 5: Configure your firewall

The last step is to configure your firewall to allow incoming and outgoing traffic for 3CX. You need to open the following ports on your firewall:


TCP/UDP5060-5061SIP signaling

UDP9000-10999RTP audio and video streams

TCP5000-5001Web server and management console

TCP443HTTPS tunneling for remote extensions and web clients

TCP/UDP3478-3479STUN/TURN server for NAT traversal

TCP/UDP50903CX tunnel protocol for remote extensions and bridges

TCP/UDP7000-7500Live chat and Facebook integration

TCP/UDP8883-8884MQTT protocol for push notifications and presence updates

TCP/UDP10000-20000WebRTC media streams for video conferencing and web meetings

You can use tools like to verify that your ports are open and reachable.


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