Specifications

10-11
Cisco IP Telephony Network Design Guide
78-11103-03
Chapter 10 Migrating to an IP Telephony Network
Reference Models for Migration Configurations
The following list summarizes the cost of the type A system:
The following list summarizes the pros and cons of the type A system:
Hardware Software
• PRI gateway for IP network
• PRI card on PBX
• Nothing extra on
Cisco CallManager
• PRI software on PBX
Pros Cons
• Easy and inexpensive to
implement
• Minimal reconfiguration of the
PBX is needed.
• Without QSIG, display set users in
particular will notice a lack of
feature support on IP-PBX calls.
• Billing is difficult to reconcile
across the two systems.