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3CX Phone System

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3CX offers a complete Unified Communications solution out of the box. As an open standards software PBX, installation and management of your phone system have never been easier.


Important update in relation to 3CX as of 2021/2022

The FQDN used to activate 3CX products will be changed to activate.3cx.com. The current activation FQDN will no longer work, no later than February 1, 2022.

What needs to be done?

Check your network access rules and make sure you allow connectivity to activate.3cx.com. Due to the nature of our cluster services, we cannot provide you with a fixed IP list.

Make sure to update your 3CX PBX to V18 update 2 by February 1, 2022. Alternatively, make sure that version 16 update 8a is installed when available, however keep in mind that it This is a short-lived fix - until November 2022.

Update to V18 to ensure long term support, compatibility and security. If you need assistance, contact a local 3CX Partner or post your questions in our 3CX Forum.

System Preparation

Before configuring the SIP trunk (in your 3CX system) it is required to go through the following checklist and make changes where necessary:

  • NAT (when used) created to 3CX


  • Firewall Checker passed


  • Firewall SIP ALG checked and if present disabled


3CX Version

Some providers gained support and compatibility with 3CX on a specific product version. It is advisable to always run the latest version of 3CX to ensure ongoing compatibility.

Minimum 3CX Version: 3CX v15.5 SP5

Adjusting the device's type

The first thing is adjusting the Device type. To do so please navigate to Main Menu → Account settings → Inbound Settings and make sure that the Protocol for Inbound DIDs is set to “SIP” and that the Device type is set to “IP PBX Server” and apply any changes made.

3CX 1.png

Then you need to make sure that the DIDs ordered are linked to your account. To do so navigate to DID Numbers / Manage DID(s). Click on the Edit DID icon and make sure that the routing points to SIP/IAX and your main account.

  • 3CX 2.png
  • 3CX 3.png

Collecting 3CX Configuration Settings

In order to be able to register and operate the trunk in 3CX you will to gather some information that will be needed in the configuration of the trunk in 3CX.

  • Username: The username for registering the trunk can be found under Main Menu → Account Information
  • Password: The trunk password can be found in the email you received from VoIP.ms during the registration process. You can also change the password by navigating to Main Menu → Account Settings → Security.
  • DID numbers: The DID numbers can be seen by navigating to DID Numbers → Manage DID(s)
  • Registrar: Go to Main Menu → Account Settings → Default DID Routing. From here make note of the selected server. In this example the server is sanjose2.voip.ms.
3CX 4.png

Configuring the Trunk with 3CX

The general instructions outlining how to add a new SIP Trunk to 3CX can be found here.

Adding the Trunk Go to “SIP Trunks” and select “Add SIP Trunk

Select Country: CA Select Provider in your Country: VoIP.ms Main trunk number: Use the DID collected from the VoIP.ms portal. You must enter the number in the national number format (e.g. 6471234567) Press OK

Under the “General” tab in the “Registrar/Server/Gateway Hostname or IP” enter the registrar as collected in the previous step.

3CX 5.png

In the “Authentication” section enter your Authentication ID and Password collected in the previous step.

3CX 6.png

Now, In the "Outbound Parameters" tab, search for "From : User Part", and select "AuthID authentication", to ensure the PBX will send the proper header when initiate the outbound calls' invite.

Once you have filled in these fields, and set the "Outbound Parameters", press OK at the TOP of the page. At this point if you refresh the page you should see your VoIP.ms Trunk appear as Registered.

Adding Additional DIDs

To associate all other DIDs/Numbers you have in your VoIP.ms account with 3CX, you need to go to the Management Console → SIP Trunks, double-click on your VoIP.ms Trunk and go to the “DIDs” tab.

Here you should already see 1 entry that is the Main Trunk number you have set. Add all other DIDs/Numbers you have to the list in the 10-digit number format (e.g. 6471234567) and press OK once you have finished.

Creating Inbound Rules

Now that you have associated all your DIDs/Numbers with your SIP Trunk in 3CX, you can create Inbound Rules to set where calls will be routed when those numbers are called. Instructions on how to create Inbound Rules can be found here.

Outbound Caller ID

VoIP.ms Trunks support Clip No Screening which means you can present any number as outbound caller ID, regardless if it’s associated with your account or not. For this to work, in any field within 3CX where the Outbound Caller ID can be set, the numbers must be input in either a 10-digit (e.g. 6471234567), 11-digit format (e.g. 16471234567) or E164 format (e.g. +16471234567).

Outbound Rules

When configuring your Outbound Rules make sure that all numbers are dialed either in the 10-digit (e.g. 6471234567), 11-digit format (e.g. 16471234567) or E164 format (e.g. +116471234567).

More information about how to create Outbound Rules and how they work can be found here.

Multiple VoIP.MS SIP Trunks on the same 3CX

Voice Trunk (Inbound)

VoIP.MS SIP Trunks can only work reliably on 3CX if there is only one SIP Trunk on each installation.
If necessary, multiple VoIP.MS SIP Trunks can exist on the same 3CX ONLY if the SIP Trunks do not share any DID numbers.
In this case, in each one of the VoIP.MS SIP Trunk settings, go to your 3CX Management Console > SIP Trunks, in the "Inbound Parameters" tab, you MUST have the [X] Call Source Identification checked.
  • User Agent: Text String
  • Custom Field
  • the default voip.ms value. (lower-case)
3CX 7.png
Also you MUST enable option "Use both "Call Source Identification" rules and "Caller Number/Name->CalledNum" field mappings".
However, 'If you do not have multiple trunks, it is recommended that this option remains disabled'.

Fax Trunk (Inbound)

If you have multiple trunk with VoIP.ms on the same 3CX instance, your "Inbound Parameters" for your FAX Trunk needs to be edited to reflex the proper User-Agent of our Fax Server. Without this correction, inbound calls to your DID (Voice/Fax) may have conflict.
Note that your Trunk needs to be registered on our FAX POP Server "fax1.voip.ms" or "fax2.voip.ms" or "fax3.voip.ms".
Go to, 3CX Management Console > SIP Trunks, in the "Inbound Parameters" tab, have the [X] Call Source Identification checked.
  • User Agent: Text String
  • Custom Field
  • use VoIPMS/SERAST instead of the default voip.ms value.
3CX FAX Voipms.png
You MUST enable option "Use both "Call Source Identification" rules and "Caller Number/Name->CalledNum" field mappings".

Outbound Caller ID Name for calls to Canada

If you would like to set an Outbound Caller ID Name with your number when you call a Canadian number, since the major canadian provider's will not using the CNAM/LIBD database, you will need to pass your Outbound caller ID Name direcly by your Trunk.

To do so, Edit your VoIP.ms Trunk in your 3CX. On your left navigation menu, click on "Trunk", then select your VoIP.ms Trunk and click on the "Outbound parameters" tab.

You will need to edit these fields.

  • From : Display Name : Select [Custom Field] : Another field at the right will appears, you will need to enter your Caller ID Name here. * SEE THE NOTE BLOW
  • From : User Part : Be sure that this option is selected to [AuthID authentication]
  • Remote Party ID - Calling Party : Display Name : Select [Custom Field] : Another field at the right will appears, you will need to enter your Caller ID Name here.* SEE THE NOTE BLOW
  - We suggest entering your outbound Caller ID Name must be in CAPITAL LETTERS. This will appears more clearly/visible on some devices.
  - You must NOT use any special characters, they will not be displayed. 
  - Use Max 15 characters, spaces included. Regular Canadian providers will not display more than 15 characters. We suggest shrinking or adapt your caller ID. 
  - Spaces are allowed in a caller id name.
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