Elastix 5 is a high-performance turnkey PBX that’s easy to install and manage. Powered by 3CX you get a complete unified communications solution with softphones included for Android, iOS, Windows and Mac as well as a web-client. Supported IP Phones, Trunks and gateways are all automatically configured with inbuilt templates. You also get integrated WebRTC video conferencing for free. Available on-premise on Windows, Linux, Raspberry Pi or in the Cloud.

You'll need to have created an IP or FQDN connection on your Telnyx Mission Control Portal account, assigned this connection to a DID and outbound profile in order to make and receive calls.

Instructions for Configuring Elastix 5 PBX IP FQDN Trunk


Elastix 5 is available to download from here.


For instructions on installation steps, please see Elastix installation guide here.

Please note down any user and password you've created which will be used for login purposes at a later stage.

Once the installation has finished, you'll be prompted to choose either running the tool from the web browser or from the command line. We recommend the web browser. There is a URL provided which you will need to use to access the graphical user interface in order to configure Elastix 5.

Video Walkthrough

Coming soon! This walkthrough will demonstrate setting up an IP based connection with Elastix 5. We'll also show you how to assign this connection to a newly purchased DID which will allow you to receive inbound calls. Then we'll walk you through how to assign the connection to an outbound profile such that you can make outbound calls!


For step by step instructions on each of the requirements on the Telnyx Mission Control Portal, please follow this guide.


You are now all set on the Mission Control Portal side and are ready to configure your Telnyx trunk within your Elastix 5 system.

As Elastix is powered by 3CX, you'll need to acquire a license key to try it out.

Once you've acquired the key, proceed to creating a new install and click next.

1. You're public IP address will automaticall be detected next and you can choose to either go with the one that was detected or enter an IP address in manually. Once you've done this, click next.

2. Choose whether your IP address is static or dynamic. Click next.

3. Select the ports required for 3CX Management console. They automatically populate default values for you but you can choose your own.

4. Proceed to select the default network adapter.

5. Your FQDN and certificates will now be generated.

6. Select how many digits your extensions should have.

7. Enter an Email for important system notifications.

8. Select Country and Time Zone.

9. Create an Operator Extension.

10. As an additional security measure, you can specify to which countries calls can be made.

11. Select your preferred language.

At this point the PBX basic settings are now fully configured and you'll be shown a congratulations page upon successfully completing the steps. Make sure you note the details that are provided but a copy of the details are also sent to the admin email you specified on a previous step. 

Use the FQDN or your public IP address URL in order to access the PBX interface. If the PBX is on your local LAN, and your router has a firewall, ensure to apply port forwarding to the ports you specified in step 3 - otherwise the interface may not resolve for you.

Login with the username and password you created.

You'll be brought the the dashboard now. 

Go to Settings -> Network to confirm your network settings:

  • "Ports" Tab: make sure your "SIP Port" is set to 5060

  • "Public IP" Tab: double check your Public IP is correct and that you have selected the proper Network card Interface

  • Settings --> Click on "Network Settings" -->  Public IP tab --> Section : "External IP Configuration". 

  • NOTE : Please make sure that connection IP on the Telnyx Mission Control Portal and Static Public IP are the same. You can also use the FQDN for inbound calls and the IP for outbound calls. 

Create Telnyx SIP Trunk:

  1. Click on "SIP Trunks" from the navigation menu on the left.

  2. Click"+ Add SIP Trunk" near the top of the screen. 

  3. A new pop up will be opened. You need to enter/select all the required details : 

Select Country: Worldwide
Select Provider in your Country: Telnyx LLC
Main Trunk No: <Enter the number which you have purchased on your Telnyx Mission Control Portal>

4.  After entering the details, Click on OK.

5.  This will open the trunk configuration window.  

  • Tabs: 

  • General

  • DIDs

  • Caller ID

  • Inbound Parameters

  • Outbound Parameters.

6.  In the General tab, we have 3 sections: 

  • I) Trunk Details 

  • ii) Authentication 

  • iii) Route calls to. 

Trunk Details: 

  • Enter name of Trunk: Telnyx LLC

  • Registrar/Server/Gateway Hostname or IP: sip-anycast1.telnyx.com:5060 or sip.telnyx.com:5060

  • Outbound Proxy: sip.telnyx.com

  • Number of SIM Calls: <set your preferred amount of simultaneous calls>


  • Type of Authentication: Do not require - IP Based

  • Authentication ID (aka SIP user ID): <enter the number which you have purchased on the Telnyx Mission Control Portal>

  • Authentication Password: <Leave Blank>

Route calls to: 

  • Main Trunk number :<By default number will be shown. You need cross verify with the number which you have purchased on telnyx portal>

  • Destination for calls during the office hours : <Based on your requirement>

  • Destination for calls outside the office hours : <Based on your requirement>

7. Select the "Options" tab

  • For "Require registration for:" select "Do not require". 

  • Remove the "GSM-FR" from Assigned Codecs 

  • Click "Apply"

8. Select the "Outbound Parameters"

  • For "Contact : User Part" in the SIP Field column Select "Custom Field". 

  • Click "Apply". 

9. After entering all the details please click on “OK” which is on the top.

If all the fields are entered correctly the IP trunk will now be live. We can now proceed to our inbound and outbound rules.

Inbound Rules: 

  • Click on "Inbound Rules" from the navigation menu on the left.

  • Click on "+Add DID Rule" near the top of the screen. 

  • There are 2 sections in this: 

  • I) General 

  • II) Route calls to


Route calls to:

Outbound Rules: 

  • Click on "Outbound Rules" from the navigation menu on the left.

  • Click on "+Add" near the top of the screen. 

  • There are 3 sections in this : 

  • I) General 

  • II) Apply this rule to these calls 

  • III) Make outbound calls on


Rule Name : <You can enter any preferred name>

Apply this rule to these calls:

  • Calls to numbers starting with prefix : <leave empty>

  • Calls from extension(s) : <You need to give the extension numbers>

  • NOTE: ‘000’ is the extension I have used as an example. 

  • Calls to Numbers with a length of : <leave empty>

Make outbound calls on:

We need to configure routes in this section. Configure up to 3 routes for calls. The second and third route will be used as backup. For each route, digits can be stripped or added. Strip Digits 0 on Route 1 and Strip Digits 1 digit for remaining 2 routes.

This is also one of the many ways an outbound caller ID can be applied within 3CX. If you choose to apply an outbound caller ID on your Outbound Route, it will be applied to all calls that proceed through this route.

Note: If you choose not to add an outbound caller ID on your outbound route, you can instead apply it for each user or extension.

After completing the configuration, press on "OK".

That's it, you've now completed the configuration of Elastix 5 IP-PBX Trunk and can now make and receive calls by using Telnyx as your SIP provider!

Additional Resources

Review our getting started with guide to make sure your Telnyx Mission Control Portal account is setup correctly!

Check out Elastix help section for extra support!

Our knowledge base is currently undergoing a makeover which will include more up to date videos to match our ever growing platform!

Can't find what you're looking for? Click the chat bubble at your lower right hand corner and start a chat!

Did this answer your question?