Specifications

Configuring Resource Pool Management
RPM Overview
DC-711
Cisco IOS Dial Technologies Configuration Guide
Call Discriminator Profiles
The Cisco RPM CLID/DNIS Call Discriminator feature lets you specify a list of calling party numbers
to be rejected for inbound calls. This Cisco IOS Release 12.2 CLID/DNIS call screening feature expands
previous call screening features in Cisco RPM. CLID/DNIS call screening provides an additional way
to screen calls on the basis of CLID/DNIS for both local and remote RPM.
Cisco RPM CLID/DNIS Call Discriminator profiles enable you to process calls differently on the basis
of the call type and CLID combination. Resource pool management offers a call discrimination feature
that rejects calls on the basis of a CLID group and a call type filter. When a call arrives at the NAS, the
CLID and the call type are matched against a table of disallowed calls. If the CLID and call type match
entries in this table, the call is rejected before it is assigned Cisco NAS resources or before any other
Cisco RPM processing occurs. This is called precall screening.
Precall screening decides whether the call is allowed to be processed. You can use the following types
of discriminators to execute precall screening:
• ISDN discriminator—Accepts a call if the calling number matches a number in a group of
configured numbers (ISDN group). This is also called white box screening. If you configure an
ISDN group, only the calling numbers specified in the group are accepted.
• DNIS discriminator—Accepts a call if the called party number matches a number in a group of
configured numbers (DNIS group). If you set up a DNIS group, only the called party numbers in the
group are accepted. DNIS gives you information about the called party.
• Cisco RPM CLID/DNIS discriminator—Rejects a call if the calling number matches a number in a
group of configured numbers (CLID/DNIS group). This is also called black box screening.
If you configure a discriminator with a CLID group, the calling party numbers specified in the group
are rejected. CLID gives you information about the caller.
Similarly, if you configure a discriminator with a DNIS group, the called party numbers specified
in the group are rejected.
The Cisco RPM CLID/DNIS Call Discriminator Feature is independent of ISDN or DNIS screening
done by other subsystems. ISDN or DNIS screening and Cisco RPM CLID/DNIS screening can both be
present in the same system. Both features are executed if configured. Similarly, if DNIS
Preauthorization using AAA is configured, it is present in addition to Cisco RPM CLID/DNIS screening.
Refer to the Cisco IOS Security Configuration Guide for more information about call preauthorization.
In Cisco RPM CLID/DNIS screening, the discriminator can be a CLID discriminator, a DNIS
discriminator, or a discriminator that screens on both the CLID and DNIS. The resulting discrimination
logic is:
• If a discriminator contains just DNIS groups, it is a DNIS discriminator that ignores CLID. The
DNIS discriminator blocks the call if the called number is in a DNIS group, which the call type
references.
• If a discriminator contains just CLID groups, it is a CLID discriminator that ignores DNIS. The
CLID discriminator blocks the call if the calling number is in a CLID group, which the call type
references.
• If a discriminator contains both CLID and DNIS groups, it is a logical AND discriminator. It blocks
the call if the calling number and called number are in the CLID or DNIS group, and the call type
references the corresponding discriminator.
Figure 102 shows how call discrimination can be used to restrict a specific DNIS group to only modem
calls by creating call discrimination settings for the DNIS group and the other supported call types
(digital, V.110, and V.120).