ZyXEL Communications 128L User Manual

Page of 114
Filter Configuration  67 
Filter Configuration 
About Filtering 
Your 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 two 
types of filters involved: incoming data filters and outgoing data filters. 
Data filters screen the data to determine if the packet should be allowed 
to pass.  
 
Figure 9-1 Outgoing packet filtering Process 
For incoming packets, your Prestige applies data filters only. Packets 
are processed depending upon whether a match is made. Your Prestige 
allows you to customize the filter sets that you wish to use. The 
following sections describe how to configure your Prestige filter sets.