Go to the “Subscribers” → “FXS/FXO ports” menu.
- Double-click to select one of the ports with “FXO” specified in the “Type” column.
- Check that the “Enable” checkbox is checked.
- Fill in the “Hotline (incoming)” field.
- Optionally, fill in the “Description” and “CallerID number” fields.
- Click the “Apply” button.

