Configuring an AVM FritzBox with 3CX

Introduction

This guide shows you how to configure an AVM Fritzbox router / firewall as a border device with 3CX. This document is based on a FritzBox 7490 running firmware FRITZ!OS 06.83. Please note that we cannot assist you in the configuration of your firewall.


AVM FritzBox Firewall / router

Step 1: Configure Port Forwarding (NAT)

This example shows the port forwarding configuration for port “5062” with a 3CX PBX system on IP 192.168.188.20:

  1. Open the Fritz!Box Web Interface.
  2. From the navigation menu on the left, go to “Internet” > “Permit Access”.
  3. In the “Port Sharing” tab, press “Add Device for Sharing”.
  4. Here fill in the following fields:
  • Set the “Device” option “Enter the IP address manually”, then enter the LAN IP address of your 3CX Server.
  • Uncheck option “Permit independent port sharing for this device”.
  1. To add the ports that you want to forward, press the “New Sharing” button. Repeat this step for each of the following protocols:
  • HTTP (TCP )
  • HTTPs (TCP)
  • SIP (TCP/UDP)
  • SECURE SIP (TCP)
  • RTP (UDP)
  • TUNNEL (TCP/UDP)

Note 1: Some Fritz!Box devices don’t allow to enter large port ranges, so you might have to break the RTP port range into smaller ranges.

Note 2: The Secure SIP port is always one port number higher than the SIP port you configured during the installation.

Port Forwarding on Fritz!Box 7490

  1. Click “Apply” to save the configuration.

Step 2: Validating Your Setup

Log into the 3CX Management Console, go to “Dashboard” > “Firewall” and run the Firewall Checker to validate if your firewall is correctly configured for use with 3CX.

More information about the Firewall Checker can be found here.

Last Updated

This document was last updated on 17 December 2018

https://www.3cx.com/docs/avm-fritzbox-firewall-configuration/