Go to the Voxtelesys Portal and log in!
Click on "APIs," then select "Keys" from the drop-down menu.
Click on the "Create Key" button.
You have now created an API Key! You can use the copy button when you add it to your PBX!
Select the "APIs" tab, then click on "Messaging Applications" from the drop-down menu.
Click on the "Create Application" button.
Select the "Phone Numbers" tab, then click on "Numbers" from the drop-down menu.
Under the "Features Enabled" and "Messaging Application" fields you can see that SMS is now enabled.