Cisco WS-X4604-GWY - VoIP Gateway Especificaciones descargar pdf (Pagina 126)

Chapter 5 Dial Plan Architecture and Configuration

Dial Plan Guidelines and Configuration

5-18

Cisco IP Telephony Network Design Guide

78-11103-03

• Intrasite, intersite, local emergency, and national long-distance PSTN calls

only

• Fully unrestricted dialing, including international numbers

Partitions and calling search spaces permit independent dial ranges on a partition

basis. This means that extensions and access codes within different partitions can

have overlapping numbers and yet function independently. The most common

application of this is in a centralized call processing system where all sites and

users share the same Cisco CallManager, yet each site can dial a 9 for local PSTN

access. This is a new capability in Cisco CallManager Release 3.0. In prior

releases, each remote site had to have its unique PSTN access code.

The following conditions apply with regard to overlapping users and extensions

at different sites with the centralized call processing system:

• Overlapping internal dial plans at different sites are supported only if voice

mail is not required. When Cisco CallManager sends a call to voice mail, it

cannot determine for which partition (and therefore which voice mail user)

the call is intended. For example, user 1111 at site A cannot be distinguished

from user 1111 at site B when the call is sent to voice mail. Voice mail users

must have unique IDs.

• If voice mail is not required, users that share extensions at different sites can

be reached by the following means:

–

PSTN—by dialing the local access code followed by the fully qualified

directory number.

–

IP WAN—by using translation tables, which can allow for prepending of

overlapping numbers with a unique steering code that is stripped off

when the call is delivered to the destination partition.

Dial Plan Guidelines and Configuration

The complexity of a dial plan can vary, depending on the number of paths over

which a call could be routed. This section describes some typical dial plan

scenarios.

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Cisco WS-X4604-GWY - VoIP Gateway Especificaciones Pagina 126