3CX is an open standards IP PBX that offers complete Unified Communications, out of the box. Suitable for any business size or industry 3CX can accommodate to your every need; from mobility and status to advanced contact center features and more, at a fraction of the cost.

3CX makes installation, management and maintenance of your PBX so easy that you can effortlessly manage it yourself, whether on an appliance or server at your premise or in the cloud. This article guides you on how to configure this PBX for making and receiving calls over the internet through a next generation carrier like Telnyx!

Additional documentation

  • For instructions on 3CX V14, check out this article!

Instructions for Configuring a 3CX V16 PBX Credentials Trunk

In this guide you will:

  1. Confirm your network setup

  2. Create a Telnyx SIP trunk

  3. Create outbound rules

  4. Configure a DID


Video Walkthrough

Setting up your Telnyx SIP portal account so you can make and receive calls:

Configuring 3CX

1. Confirm Your Network Settings

  1. Click on Network in the left-hand menu.

  2. Expand the Ports tab and verify:

    1. SIP Port: 5060

  3. Expand the Public IP tab and verify that your Public IP is correct and that you have selected the proper Network card Interface.

2. Create a Telnyx SIP Trunk

  1. Select SIP Trunks from the navigation menu on the left.

  2. Click + Add Provider near the top of the screen.

  3. Fill out the following:

    1. Name of Provider: A name that will help you recognize your trunk.

    2. Country: Select your country

    3. Provider: Select Telnyx LLC

      1. Not seeing Telnyx listed? No Problem! Select Updates from the navigation menu on the left (should be the last option at the bottom). Select "SIP Trunk Template Updates". Find the "Telnyx LLC" update from the list and select it. Click "Download Selected" near the top of the screen. You should now see Telnyx in the provider list when creating a SIP Trunk.

  4. Click Next. All of the information will automatically be added for the VOIP Provider Details step and you can simply click Next.

  5. You will be taken to Account Details. Enter the following:

    1. External Number: The number you purchased on your Telnyx Mission Control Portal

    2. Authentication ID: The number you purchased on your Telnyx Mission Control Portal

    3. Authentication Password: Leave blank

  6. Click Next.

  7. This will bring you to the step where you can determine how you would like to have incoming calls routed. Configure these as you'd like.

  8. Click Next.

3. Create Outbound Rules

In this step you will create an outbound rule that meets your rule requirements. If you are not familiar with doing so, you can use the following settings in the Define to which outbound calls the rule must apply section:

  1. Calls to numbers starting with prefix: 1.

  2. Calls from extension(s): (leave blank).

  3. Calls to Numbers with a length of: (leave blank).

  4. Select Extension Group: (leave as is).

  5. Calls from extension group: (leave as is).

  6. 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 1 digit for all 3 routes.

  7. Click Finish -- You should now see the newly created Trunk listed below.

  8. Click on the trunk and select Edit Provider.

    1. Select the "Advanced" tab and make the following changes.

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

    3. "Remove the "GSM-FR" from Assigned Codecs.

  9. Click "Apply".

  10. Select the "Outbound Parameters" tab and make the following changes.

    1. For "Contact : User Part" in the SIP Field column, select "Custom Field". 

    2. To allow private calling: 

    3. "From : Display Name" and "From : User Part", select "Custom Field" but leave the Custom values blank. This will allow for private calling.

  11. Click "Apply".

Note: If a valid caller ID is not supplied from 3CX, then the call will reach Telnyx with no caller ID. Please review our caller ID number policy for instructions on setting a caller ID override on your SIP connection.

4. Configure a DID

  1. Select the "DID" tab and make the following changes.

    1. Input the number you purchased on the Telnyx Mission Control Portal and click Add.

  2. Click "Apply" and then OK.

You can now access the extensions section on the left pane in order to retrieve the default extensions username and password which you will use to register with your 3CX Server.

That's it, you've now completed the configuration of 3CX V14 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!

Additionally, you can check out:

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

*Note that you must be logged into your Telnyx Mission Control Portal in order to interact with the chat bubble.

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