ZyXEL Communications P-660H-Tx v2 - Manual (Page 135)

Chapter 9 Firewall Configuration
P-660H-Tx v2 User’s Guide
135
Figure 70 Firewall Example: Edit Rule: Destination Address
9 Use the Add >> and Remove buttons between Available Services and Selected
Services list boxes to configure it as follows. Click Apply when you are done.
"
Custom services show up with an “*” before their names in the Services list
box and the Rules list box.