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Chapter 10 Migrating to an IP Telephony Network

Reference Models for Migration Configurations

10-16

Cisco IP Telephony Network Design Guide

78-11103-03

For voice messaging, model C fixes the drawbacks of model B. Because the voice

messaging system deals with the PBX and the IP network as separate systems,

calls that reach the IP network can be forwarded directly into voice messaging

without being routed back through the PBX. This should allow all normal call

answering and message retrieval functions. In addition, since the voice messaging

system is connected to the IP network directly with SMDI, the voice messaging

system can send MWI on or off messages to the IP network for appropriate control

of the indicators on the IP phones.

For this model to work, the voice messaging system must meet two qualifications.

First, it must be able to support two PBXs simultaneously in its database and

associate each mailbox with the correct PBX so that it can send MWI information

on the correct link. Second, it must be possible to connect the IP network

physically to the voice messaging system while maintaining the existing link to

the PBX. Not all voice messaging systems can support this type of integration,

and customers should therefore check with their voice mail vendor before

proceeding with this type of scenario.

The following configuration steps are required for the type C system:

Step 1 Configure PRI link—same as for type A system.

Step 2 Migrate each user—same as for type A system.

Step 3 Migrate each user in voice mail—change the mailbox to reference the link to the

IP network rather than the PBX.

Step 4 Move PSTN trunks from PBX to IP network—same as for type A system.

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Cisco WS-X4604-GWY - VoIP Gateway Especificaciones Pagina 218