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Cisco IP Telephony Network Design Guide

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Chapter 5 Dial Plan Architecture and Configuration

Cisco CallManager Dial Plan Architecture

An important feature of the route pattern dial structure is that it is typically used

when IP phone calls are destined to go to gateways or remote Cisco CallManagers

using H.323. In these cases, alternate routes can be taken in the event the primary

path to a destination is not available. This is the scheme described in Chapter 6,

“Multisite WAN with Distributed Call Processing,” where all intersite calls take

the IP WAN as the primary path and the PSTN as the secondary path.

Calls between IP phones that reside on the same Cisco CallManager or

Cisco CallManager cluster do not use the route pattern dial structure and,

therefore, cannot use alternate routes if connectivity is down between them. If IP

connectivity is lost between two IP phones, it is probably because one of the

phones has lost connectivity to its Cisco CallManager. This can happen, for

example, when using multisite WAN deployments with centralized call

processing. In such cases there is no alternate routing between sites.

Digit Translation Tables

Cisco CallManager supports digit translation. This is the ability to translate the

called and calling numbers into other numbers, including changing the number of

digits. Digital translation is applicable for internal as well as external calls,

inbound or outbound.

A common application of a translation table is to direct unassigned direct inward

dialing (DID) numbers to an attendant when such numbers are dialed. For

example, assume you have a DID range of 1000 to 1999 and want all calls to

unassigned DID numbers to go to an attendant at extension 1111. You can

configure a translation table of 1XXX that points to a translation mask of 1111, as

follows:

In this example, Cisco CallManager performs a longest match lookup using

wildcards. If there is an IP phone with a matching directory number in the

1000-1999 range, Cisco CallManager sends the call to that phone. If there is no

matching IP phone number in the 1000-1999 range, then there is a match on the

1XXX translation table, and the call is sent to extension 1111.

Translation Table Translation Mask

1XXX 1111

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