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Cisco IP Telephony Network Design Guide

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Chapter 5 Dial Plan Architecture and Configuration

Configuring Dial Plan Groups and Calling Restrictions

Partitions

A partition is a group of devices with similar reachability characteristics. Devices

you can place in partitions are IP phones, directory numbers, and route patterns.

Each partition name should be chosen to have some meaningful correlation to the

group of users it represents. For example, for users located in Building D in San

Jose, you could create a partition called SJ-D.

Calling Search Space

A calling search space is an ordered list of partitions that a user can search before

being allowed to place a call. Calling search spaces are assigned to devices that

can initiate calls. These include IP phones, Cisco SoftPhones, and gateways.

Dialing restrictions are simple to invoke because users can dial only the partitions

in the calling search space to which they are assigned. Dialing a directory number

outside an allowed partition causes the caller to receive a busy signal.

An analogy can be drawn between partitions and calling search spaces and routers

with access control lists (ACLs). Think of a partition as an IP subnet where you

place users. A calling search space is analogous to an inbound ACL that dictates

which subnet you can reach.

Figure 5-5 illustrates the analogy of partitions and calling search spaces to ACLs.

Figure 5-5 Partition/Calling Search Space-Subnet/ACL Analogy

Figure 5-6 is a simple example of how partitions and calling search spaces can be

used to provide dialing restrictions.

Inbound access-list/

calling search space

You can reach these

subnets/partitions

Subnet/

partition A

Subnet/

partition B

Subnet/

partition C

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Cisco WS-X4604-GWY - VoIP Gateway Especificaciones Pagina 123