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4. Configure the Firewall

This module explains what network traffic 3CX generates and the configuration a Firewall requires. It also covers which ports 3CX uses and how to check your Firewall configuration. In more detail:

  • Setup the Firewall
  • NAT & Port Preservation
  • Setup for Provider, SBC, Bridges
  • Setup Remote IP (STUN)
  • Validation

Follow the course

Read the course content here and follow the presentation below or watch the pre-recorded webinar here.

Test your Knowledge

After completing this module you will know which ports 3CX uses and when. This will allow you to configure your Firewall correctly and use the Firewall Checker to validate your setup.

Check how ready you are to take the test:

Q. Will the 3CX Support Team assist you in configuring your Firewall?

Q. Assuming your SIP Port is 5060, should you make sure that NAT rules have been put in place on your Firewall for both UDP and TCP?

Upcoming Webinars:

No webinars scheduled at present. Check back soon
3CX Webinar = Webinar 3CX Event = Face to Face Training

Free for up to 1 year! Select preferred deployment:


for Linux on a $200 appliance or as a VM

Get the ISO


for Windows as a VM

Download the setup file

On the cloud

In your Google, Amazon, Azure account

Take the PBX Express