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Cisco IP Telephony Troubleshooting Guide for Cisco CallManager Release 3.0(1)
© 2000 Cisco Systems, Inc. 40
of partitions to which it is permitted to place calls — its partition search space. This provides for
extremely powerful control over routing.
When a call is being placed, Digit Analysis attempts to resolve the dialed address only in those
partitions that the partition search space specifies. Each partition name comprises a discrete
subset of the global dial-able address space. From each listed partition, Digit Analysis retrieves
the pattern that best matches the sequence of dialed digits. Then, from among the matching
patterns, Digit Analysis chooses the best match. If two patterns equally match the sequence of
dialed digits, Digit Analysis breaks the tie by selecting the pattern associated with the partition
listed first in the partition search space (for more information, review the documentation about
Closest-Match Routing).
Security
Cisco CallManager can be configured to create a secure dialing plan for users. This can be done
through the use of partitions and calling search spaces, in addition to more common filtering
based on sections of the "@" macro (which stands for the North American Numbering Plan) in a
route pattern, such as the Area Code. Partitions and Calling Search Spaces are an integral part of
security and are especially useful for multi-tenant environments and creating an individual user
level. Filtering is a subset of the Calling Search Space/Partition concept that can add additional
granularity to the security plan.
This is an extension to the Dial Plan section above. Be advised, usually the last thing you want to
do when trying to fix a filtering problem is to run an SDI trace. There is simply not enough
information and the potential for causing more harm is too great.
Run a "show tech" on Cisco CallManager. The following information appears in the Route Filter
section.
Show-tech
Name dialPlanWizardG Clause
CiscoDallasInte 1 (INTERNATIONAL-
CiscoRTPTollByP 1 (AREA-CODE == 9
CiscoRTPLongDis 1 (AREA-CODE EXIS
CiscoDallasToll 1 (AREA-CODE == 9
CiscoDallas911R 1 (SERVICE == 911
CiscoRTPLocal7D 1 (AREA-CODE DOES
CiscoDallasLong 1 (AREA-CODE EXIS
CiscoRTP911RF 1 (SERVICE == 911
CiscoRTPInterna 1 (INTERNATIONAL-
CiscoDallasLoca 1 (LOCAL-AREA-COD
Unfortunately the display is cut off. It does at least give a listing of all the Route Filters in the
system. There is no way from the "show" command to see what filters are associated with which
Route Pattern. Another way to get a handle on the dial plan is to go to the Route Plan Report
page. Following is an option on the far right-hand side to "View In File".