FreePBX is a web-based open source GUI (graphical user interface) that controls and manages Asterisk (PBX), an open source communication server. FreePBX is licensed under the GNU General Public License (GPL), an open source license. FreePBX can be installed manually or as part of the pre-configured FreePBX Distro that includes the system OS, Asterisk, FreePBX GUI and assorted dependencies.

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

PJSIP is an Open Source and separate extension of the Asterisk, and Asterisk derived systems. It provides a resource for assigning multiple trunks via SRV addresses, and more options. PJSIP also provides three main components of real-time multimedia application, i.e. signaling, media features, and NAT traversal, among other things that have been taken care of by PJSIP.

We suggest using PJSIP as an upgrade from Chan_SIP, as Chan_SIP is outdated, and the majority of users are moving to PJSIP which provides a number of more future proof options, and is still actively being improved by the community. You can find out more about PJSIP here.

Instructions for Configuring a FreePBX V15 Credentials trunk


FreePBX V15 is available to download from here.


You can view the installation guide here.

Video Walkthrough

Coming soon! This walk-through will demonstrate setting up an Credentials based SIP connection with FreePBX. 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.

Once you've configured your Telnyx account, you can now proceed to setup FreePBX V15 following the guide below.


You are now all set on the Mission Control Portal side and are ready to configure your Telnyx trunk within your FreePBX V15 system


1. Once you load the ISO onto your server or virtual machine, you'll have a few options to select for installation. We'll be doing a full install via asterisk 16.

2. You'll be prompted for your preferred video method you want to install.

3. The installer will now start.

4. The installer will start but you will see it shows the root password is not set. You will need to click on the root password box to set your root password. The installation process can not complete until this is done.

5. Type in your root password and confirm it a second time and click on the Done option in the top left screen.

6. At this time the FreePBX package itself can take 15 or more minutes to install and does requires access to the internet so depending on your internet speeds it can take awhile to install so be patient.

7. Once the install has 100% completed it will give you a reboot option as shown below. Click on reboot your your system is now installed.

8. Once the process is complete, you'll reach the Linux console/command prompt login. You can log in here using the username "root" without quotes, and the Root password you selected earlier.

9. After you log in, you should see the IP address of your PBX as shown below. Take note of this IP address as you will need it in the next step.

10. Enter the IP address of the new PBX into your web browser. The first time you do so, you'll be asked to create the admin username and the admin password. That username and password will be used in the future to access the FreePBX configuration screen.

Note: These passwords do not change the Root password! They are only used for access to the FreePBX web interface.

11. Once submitted you can log in to the admin panel with the username and password set up on the step above. The main FreePBX screen will offer you four options:

  • FreePBX Administration will allow you to configure your PBX. Use the admin username and admin password you configured in the step above to login. This section is what most people refer to as "FreePBX."

  • User Control Panel is where a user can log in to make web calls, set up their phone buttons, view voicemails, send and receive faxes, use SMS & XMPP messaging, view conferences, and more, depending on what you have enabled for the user, see User Control Panel (UCP) 14+ for more information.

  • Operator Panel is a screen that allows an operator to control calls (needs additional licensing)

  • Get Support takes you to a web page about various official support options for FreePBX.

Basic Settings Configuration:

1. You'll be brought to the initial setup and must enter in the username, password and admin email address in order to create your account.

2. Once you've created your account, you'll be brought to the dashboard. Select FreePBX Administration and enter your username and password.

3. Follow the process to activate your FreePBX V15.

4. Select your default locales.

5. You'll be presented with some firewall details and other suggestions. You are welcome to set this up based on your requirements.

Eventually, you'll be back at the dashboard and now see more details.

At this point you can now work on confirming network settings and configuring your SIP trunks and extensions.

Make your way to Settings -> Asterisk SIP Settings in order to confirm your network settings.

You'll want to ensure you populate the external and local network addresses under General SIP Settings and PJSIP Settings.

Click Submit and then Apply Config.


Make your way to Applications -> Extensions -> Add Extension -> Add New Chan PJSIP Extension. The Outbound CID is the number you purchased from your Telnyx Mission Control Portal. The extensions secret may need to be populated under the Other tab.

If you do not set an Outbound CID for your Extension, you must enable this on your trunk.

This device uses PJSIP technology listening on Port 5060 (UDP)

Click Submit and Apply Config.

For testing purposes, you can now use your SIP client to register with FreePBX using the username, password/secret and local IP address of your FreePBX.


Make your way to Connectivity -> Trunks -> Add Trunk -> Add New PJSIP Trunk. You'll now be located in the General tab.

Enter a Trunk name, your Outbound CID and the maximum channels you'd like for this trunk.

Note: If you choose not to set an Outbound CID on your trunk, then you must set an Outbound CID on each relevant extension. If you do not set a caller ID on either the trunk or each extension, then your calls will reach our SIP proxy without a valid caller ID. You may instead choose to enable a Caller ID Override in your SIP Connection’s Outbound Options from within the Telnyx Portal. Please review our caller ID number policy for accepted formats.

Proceed to the Dialed Number Manipulation Rules tab.

Depending on your use case, we've provided a simple dial pattern US numbers below.

For US numbers:

  • prepend:1; match pattern: NXXNXXXXXX

  • prepend: blank; match pattern: 1NXXNXXXXXX


  • prepend: Country Dialing prefix; match pattern: NXXNXXXXXX

  • prepend:blank; match pattern: (Country Dialing prefix)NXXNXXXXXX

PJSIP Outbound Authentication Settings

Make sure to specify:

  • Username - as the credential based SIP Connections username from your Telnyx account.

  • Auth Username - as the credential based SIP Connections username from your Telnyx account.

  • Secret - as the credential based SIP Connections password from your Telnyx account.

  • SIP Server - as your preferred Telnyx SIP Proxy ( in this instance for USA).

  • SIP Server Port - as port 5060.

Click Submit and Apply Config.

WARNING: This trunk is not used by any routes! This trunk will not be able to be used for outbound calls until a route is setup that uses it. Click on Outbound Routes to setup routing.

Make your way to Connectivity -> Outbound Routes -> Add Outbound Route

In Route Settings:

  • Set the route name

  • Ensure Telnyx Trunk is selected for the trunk sequence

In Dial Patterns:

Use the dial pattern wizards to make all the dial patterns that apply to you.

Click Generate Routes, Submit and Apply Config.

Inbound Routes

Make your way to Connectivity -> Inbound Routes -> Add Inbound Route.

Enter the route name description, DID associated with this route and specify the extension that should be associated when calls are received to the DID.

Click Submit and Apply Config.

NOTE: By default, when creating a SIP Connection in the Telnyx Mission Control Portal, the number formats for the ANI and DNIS will be set to E.164. This means Telnyx will send the dialled number in the SIP INVITE to your FreePBX system with 11 digits. As the DID number above is in 11 digit format, the call will be accepted and routed to the extension. However, you can control the number formats as you desire and can read more about it here.

That's it, you've now completed the configuration of FreePBX V15 Credentials PJSIP 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 FreePBX's help section for community or paid support.

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

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