Draytek VigorPro 5500 Series User Manual page 197

Note: DT-DT means you can acquire the anti-intrusion and anti-virus services
from DrayTek Corporation.
8. Next, the DrayTek Service Activation screen will be shown as the following:
(Above figure supposes you have not activated Anti-Spam yet.)
9. Click Close.
VigorPro5500 Series User's Guide 189