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Unified IP IVR (CRS) Design Considerations
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Chapter 3 Design Considerations for High Availability
Figure 3-8 High Availability with Two Unified IP IVR (CRS) Servers and One Cisco Unified CallManager Cluster
Public
network
TDM
access
T1 lines
Voice
Voice
T1 lines gateway 1
gateway 2 Gatekeepers
V
V
IDF
switch 1
IDF
switch 2
MDF
switch 1
Cisco CallManager
cluster
Publisher
Sub 1 M Sub 2
M M
IP IVR 1 IP IVR 2
IP IVR group
MDF
switch 2
Corporate
LAN
Firewall
Call control, CTI data,
IP messaging
TDM voice lines
Ethernet lines
You can increase Unified IP IVR (CRS) availability by using one of the following optional methods:
Call-forward-busy and call-forward-on-error features in Cisco Unified CallManager. This method is
more complicated, and Cisco recommends it only for special cases where a few critical CTI route
points and CTI ports absolutely must have high availability down to the call processing level in
Cisco Unified CallManager.
Unified ICM script features to check the availability of a Unified IP IVR (CRS) prior to sending a
call to it.
Note Do not confuse the Unified IP IVR (CRS) subsystems with services. Unified IP IVR (CRS) uses only
one service, the Cisco CRS Node Manager service. The Unified IP IVR (CRS) subsystems are
connections to external applications such as the CTI Manager and Unified ICM.
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