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Cisco IP Telephony Network Design Guide
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Chapter 10 Migrating to an IP Telephony Network
Reference Models for Migration Configurations
The following list summarizes the cost of the type C system:
The following list summarizes the pros and cons of the type C system:
Hardware Software
• PRI gateway for IP network
• PRI card on PBX
• Analog gateways for IP network
for voice messaging
• Analog cards on voice messaging
system
• SMDI interface on voice
messaging system
• Nothing extra on
Cisco CallManager
• PRI software on PBX
Pros Cons
• IP users can maintain access to
voice messaging as they migrate
from the PBX.
• Relatively inexpensive to
implement
• Same voice feature shortfall as
type A systems
• More complex administration of
voice messaging system than the
type B system, but simpler
administration of the PBX
• Ideally, DID (DDI) trunks would
be moved from PBX to IP network
to follow the users. Otherwise,
some features might be lost.
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