1. Log into Comma GUI of unit. (https://sites.google.com/site/comxwiki/how-to-log-into-the-comma-gui-of-your-com-x)
2. Select Start
3. Select Configuration
4. Select Extensions Tab
5. Adding Extensions:
6. Right click on an available extension port in the ports list.
7. Select Assign
8. Enter an extension number in the Extension Start field.
9. Select Accept.
10. Select Review Apply
11. To confirm if device has been assigned configured extension, from device dial *65, and a voice prompt should replay your extension number configured.