3Com WL-537 User Manual page 71

Firewall 75
Contnet Filter You can subscribe to the 3Com Content Filter Service, which enables you
to block or allow the URL of a number of pre-defined categories.
The Router comes with a 14-day free trial of the 3Com Content Filter
Service. To activate the 14-day free trial of the service, you must first
register your Router at www.3com.com. To continue using the service
after the trial period, you must purchase the Full 3Com Content Filter
Service(3CS8CFS).
URL Filtering rules supersede content filtering rules. If the 3Com Content
Filter is blocking certain Web sites that you want to allow, you can add
these sites to URL Filter's allow list.