ZyXEL Communications P-660HW-Tx v3 User Manual page 196

Chapter 9 Firewalls
Configure other settings in Schedule. Click Apply when you are done.
8
Note: Custom services show up with an "*" before their names in the Services list box
and the Rules list box.
On completing the configuration procedure for this Internet firewall rule, the
Rules screen should look like the following.
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P-660HW-Tx v3 User's Guide