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Chapter 10 Migrating to an IP Telephony Network

Reference Models for Migration Configurations

10-18

Cisco IP Telephony Network Design Guide

78-11103-03

Detailed Discussion of Model D

Figure 10-9 shows the topology for model D, which includes a PBX with voice

messaging system that migrates to an IP network with Cisco uOne unified

messaging. The discussion of this model considers only the voice messaging

component of Cisco uOne.

Figure 10-9 Model D—PBX with Voice Messaging and Migration to Cisco uOne

Messaging

The considerations for telephony features for model D are the same as for

model A.

For voice messaging, IP users are on the Cisco uOne system, while the PBX users

remain on the voice messaging system. When a PBX user is moved to the IP

network, the voice mailbox is deleted from the voice messaging system, and a new

one is added on Cisco uOne.

Because there is no linking between Cisco uOne and the voice messaging system,

the two user groups are separate and cannot interact in voice messaging. For

instance, if a voice messaging user has a distribution list, IP users cannot be

included on it. Similarly, the “reply to sender” function does not work between

the two groups, nor do a number of other features. If the voice messaging system

is to be replaced by Cisco uOne, however, this situation is only temporary.

PSTN

PBX

LAN

Migration

Gateway

Voice

messaging

system

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