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     * Supported SIP Trunks
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 1. Home
 2. Configuration guides and docs
 3. Anti Hacking – Whitelist/Blacklist




3CX PHONE SYSTEM ANTI HACKING – WHITELIST/BLACKLIST

 * Introduction
 * Adding a Whitelist Entry to 3CX Phone System
 * Blocking an IP Address or a Range of IP Addresses
 * See Also


INTRODUCTION

3CX allows you to whitelist and blacklist IP addresses. All traffic from
whitelisted IP addresses will be granted without being checked by the
anti-hacking features. All traffic from blacklisted IP addresses will be stopped
immediately. This guide explains how to configure new whitelist and blacklist
entries in 3CX.


ADDING A WHITELIST ENTRY TO 3CX PHONE SYSTEM

Let’s assume that you have a remote office connected to your 3CX Phone System.
Your remote office has a public IP address of 123.123.123.123. Traffic from this
IP address is trusted. To add a whitelist for this IP address, you’ll need to do
the following:



 1. Go to “Advanced” > “IP Blacklist” in the 3CX Admin Console.
 2. Click “Add” to add an entry.
 3. From the dropdown menu select “Add single IP Address” and enter the IP
    address that you want to allow, e.g. 123.123.123.123 (you can also select to
    add a range of IP addresses using a subnet mask).
 4. Set Action to “Allow”.
 5. Add a description for the IP address, e.g. “Remote office”.
 6. Click on “OK” to create an Allow entry in the IP Blacklist for the
    whitelisted IP address. All traffic originating from this IP address will be
    unchecked and the anti-hacking algorithms will not come into effect.


BLOCKING AN IP ADDRESS OR A RANGE OF IP ADDRESSES

Let us look at another scenario. Assume that there is a distributed attack
coming from the following IP addresses – 41.202.160.2 and 41.202.191.5. These
two IP addresses have already been blacklisted by 3CX Phone System’s
anti-hacking auto-detection mechanisms. You would, however, want to blacklist
all the range, since you are sure that you will never get any traffic from these
IP addresses. In this case, we will blacklist the whole range from 41.202.0.0 to
41.202.255.255 i.e. all the IP addresses that start with 41.202.



 1. Go to “Advanced” > “IP Blacklist” in the 3CX Admin Console.
 2. Click “Add” to add a new entry.
 3. From the drop down menu select “Add a range of IP Addresses“.
 4. Enter the “Network address” which is the first address of the network range
    you want to block. For this example we will enter 41.202.0.0.
 5. To block all IP addresses starting with 41.202, we select “/16” as “Subnet
    Mask”, i.e. 255.255.0.0.

💡 Tip: The range of IP addresses contained by the network mask is displayed
below in “IP address range”.

 6. Set Action to “Deny“.
 7. Enter a Description for this entry to help you remember why you added this
    entry, for example “Distributed attack coming from 41.202.x.x”.
 8. Click on “OK” to create a Deny entry in the IP Blacklist. All traffic coming
    from this IP address range will be checked, anti hacking algorithms will
    come into effect and completely drop and ignore all packets from these IPs.

The 3CX anti-hacking Blacklist / Whitelist mechanism does not replace a
firewall. It provides a defense mechanism to help separate traffic that is
trusted, and traffic that is not trusted. If for example you want to block all
traffic to your network and allow only your VoIP Provider IP address, you need
to set this up on your firewall.

When configuring a range of IP addresses in the blacklist, you should also
ensure that the range does not include the IP address of the PBX.


SEE ALSO

 * Blocking Calls from Anonymous Callers
 * Security & Anti-Fraud - 3CX Advanced Training
 * How to reset  3CX security credentials

Last Updated

This document was last updated on 11 September 2024

https://www.3cx.com/docs/allow-deny-ip-addresses/ 


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