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Filter Configuration
About Filtering
Your IRT-1001 or IRT-1002 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. The router has default call filters
that filter out administrative packets, e.g., RIP and SAP packets. The
router applies the default filters first, and then the user-defined call filters
if applicable, as shown below:
For incoming packets, your IRT-1001 or IRT-1002 applies data filters
only. Packets are processed depending upon whether a match is made.
IRT-1000 series User's Guide
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