ZyXEL zyxel Prestige100 User Manual download pdf (Page 89)

Filter Configuration 77

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Filter Configuration

About Filtering

The Prestige uses filters to decide whether or not to allow passage

of a data packet and/or to make a call over the ISDN line. There

are three types of filters involved: incoming data filters, outgoing

data filters, and call filters. Data filters screen the data to determine

if the packet should be allowed to pass. Call filters are used to

determine if a call should be placed.

Outgoing packets must pass through the data filters before they

encounter the call filters. Call filters are divided into two groups:

default call filters and user-defined call filters. Prestige has default

call filters that filter out administrative packets, e.g., RIP and SAP

packets. The Prestige applies the default filters first and then the

user-defined call filters if applicable as seen below:

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ZyXEL zyxel Prestige100 User Manual Page 89