
Chapter 10 Migrating to an IP Telephony Network
Reference Models for Migration Configurations
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Detailed Discussion of Model B
Figure 10-7 shows the topology for model B, which includes both a PBX and
voice messaging.
Figure 10-7 Migration Model B—PBX with Voice Messaging
The considerations for telephony features in model B are the same as for model
A, but the introduction of voice messaging brings a number of extra
considerations. In general, voice messaging systems provide call answering and
call retrieval services. They also command the PBX to switch message waiting
indicators on and off and can provide outcalling services where users can transfer
themselves out of a voice mailbox to another phone. (This feature is also a
function for automated attendant functions, which are often built into voice
messaging systems.)
PSTN
PBX LAN
Migration
Voice
messaging
system
V
IP
IP
IP
40840
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