Cisco Unified Contact Center Enterprise Solution Reference ...

Chapter 3 Design Considerations for High Availability
Figure 3-23 Redundant CTI Servers Co-Located on Agent PG
Public
network
TDM
access
CTI OS Considerations
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T1 lines
Voice
Voice
T1 lines gateway 1
gateway 2 Gatekeepers
V
V
IDF
switch 1
IDF
switch 2
MDF
switch 1
Call control, CTI data,
IP messaging
TDM voice lines
Ethernet lines
Agent PG
CTI Server
A
ICM A
Cisco CallManager
cluster
Publisher
Sub 1 M Sub 2
M M
ICM B
ICM central controllers
Agent PG
CTI Server
B
MDF
switch 2
IP IVR 1
VRU
PG A
IP IVR
group
IP IVR 2
VRU
PG B
Cisco Unified Contact Center Enterprise 7.x SRND
CTI OS Considerations
CTI OS Server is a software component that runs co-located on the Cisco Unified CallManager
Peripheral Gateway. CTI OS Server software is designed to be fault-tolerant and is typically deployed
on redundant physical servers; however, unlike the PG processes that run in hot-standby mode, both of
the CTI OS Server processes run in active mode all the time. The CTI OS Server processes are managed
by NodeManager, which monitors each process running as part of the CTI OS service and which
automatically restarts abnormally terminated processes.
CTI OS handles failover of related components as described in the following scenarios (see Figure 3-24).
AW
A
Firewall
Corporate
LAN
IPCC Site
WedView
Reporting Client
AW
B
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