Zhone 6238-I2 User Manual page 39

The following screen appears when you Save/Apply the IP filter. The screen
lists the IP filters that were added from the previous screen. To change your
settings, click on the Add or Remove buttons.
IP Filtering—Incoming
Incoming IP filter filters the WAN traffic to the LAN side. Click on the Add
button to add incoming filter settings.
6238-A2-ZB20-10 6238 Wi-Fi Router with VOIP User's Guide 39