Required access: 3CX, Voxtelesys Portal
Last Updated: 9/1/2026
Learning Hub / Tutorials / 3CX / SMS Setup (V20)FAQs
Tutorials: SMS Setup (V20)
Configure SMS in 3CX Version 20 and the Voxtelesys Portal.
Enter your credentials.
Click on the "Admin" button in the lower left side of the screen.
Click on the "Voice & Chat" tab from the dashboard.
Click on or select the three dot icon to edit your Voxtelesys SIP Trunk.
Click on the "SMS" tab.
- Enable SMS: Check this box.
Copy the Webhook.
Go to the Voxtelesys Portal and enter your credentials.
Open the "Channels" category, click on the "Messaging" tab, then select "Messaging Applications" from the drop-down menu.
Click on the blue "+" button.
Profile Name: Enter the Name you want for the profile (ex. 3CX SMS).
Trunk Group: Select your service trunk from the drop-down menu.
Action Type: Select “Send HTTP Callback.”
HTTP Method: Select "POST" from the HTTP Method drop-down menu.
Events: Select "Both" from the Events drop-down menu.
MO Webhook: Copy and paste the SMS Webhook from 3CX. See step 5 on copying the SMS Webhook.
DR Webhook: Same as the MO Webhook.
Authentication: Select "None" for this configuration.
Click on "Confirm" when you are finished.
In the "Account" category, click on the "API Access" drop-down and select "API Keys."
Click on the "Create Key" button.
Service Trunk Group: Select the service trunk group to be associated with the API key.
Name: Enter "3CX SMS" as the API key's name.
Status: Toggle to enable the API key.
Click "Confirm" to proceed.
Important Note
This is the only time you can copy the API key. It is visible only in this window and will not be shown again after you close it, so save it in a secure location.
This is the only time you can copy the API key. It is visible only in this window and will not be shown again after you close it, so save it in a secure location.
Copy the API Key you created.
Save the key in a secure location, as it will not be shown again after the window closes.
In 3CX, Paste the API Key in the "API Key" text box.
In the "Number Provisioning" category, click on the "Phone Numbers" tab, then select "Numbers" from the drop-down menu.
Select the pencil icon under actions.
SMS Enabled: Check this box to enable SMS on this phone number.
Service Trunk: Select your service trunk from the drop-down menu.
Messaging Application: Select your messaging application: "3CX SMS" from the drop-down menu.
Campaign: Select your campaign. If you have not created a campaign yet please follow our guide on The Campaign Registry (TCR). You must have a campaign to enable SMS on your numbers.
Click on "Confirm" when you are finished.
Learning Hub / Tutorials / 3CX / SMS Setup (V20)FAQs
