Cisco Cisco IP Contact Center Release 4.6.2 Leaflet
3-28
Cisco Unified Contact Center Enterprise 7.5 SRND
Chapter 3 Design Considerations for High Availability
Peripheral Gateway Design Considerations
Redundant/Duplex Unified CCE Peripheral Gateway Considerations
Unified CCE Agent PGs are deployed in a redundant/duplex configuration because the PG has only one
connection to the Unified CM cluster using a single CTI Manager. If that CTI Manager were to fail, the
PG would no long be able to communicate with the Unified CM cluster. Adding a redundant or duplex
PG allows the Unified ICM to have a second pathway or connection to the Unified CM cluster using a
second CTI Manager process on a different Unified CM server in the cluster.
connection to the Unified CM cluster using a single CTI Manager. If that CTI Manager were to fail, the
PG would no long be able to communicate with the Unified CM cluster. Adding a redundant or duplex
PG allows the Unified ICM to have a second pathway or connection to the Unified CM cluster using a
second CTI Manager process on a different Unified CM server in the cluster.
The minimum requirement for Unified ICM high-availability support for CTI Manager and Unified
IP IVR is a duplex (redundant) Agent PG environment with one Unified CM cluster containing at least
two subscribers. Therefore, the minimum configuration for a Unified CM cluster in this case is one
publisher and two subscribers. This minimum configuration ensures that, if the primary subscriber fails,
the devices will re-home to the secondary subscriber and not to the publisher for the cluster. (See
IP IVR is a duplex (redundant) Agent PG environment with one Unified CM cluster containing at least
two subscribers. Therefore, the minimum configuration for a Unified CM cluster in this case is one
publisher and two subscribers. This minimum configuration ensures that, if the primary subscriber fails,
the devices will re-home to the secondary subscriber and not to the publisher for the cluster. (See
.) In smaller systems and labs, Cisco permits a single publisher and single subscriber, which
means if the subscriber fails, then all the devices will be active on the publisher. For specific details
about the number of recommended Unified CM servers, see
about the number of recommended Unified CM servers, see
Figure 3-17
Unified ICM High Availability with One Unified CM Cluster
TDM
access
188802
Sub 1
Sub 2
Unified CM
cluster
MDF
switch 1
Call control, CTI data,
IP messaging
TDM voice lines
Ethernet lines
IP messaging
TDM voice lines
Ethernet lines
ICM A
IP IVR 1
IP IVR 2
CM
PG A
CM
PG B
IP IVR
group
ICM central controllers
Publisher
IP-IVR
PG A
IP-IVR
IP-IVR
PG B
M
Public
network
V
IDF
switch 1
IDF
switch 2
V
Voice
gateway 1
Voice
gateway 2
T1 lines
T1 lines
M
M
ICM B
MDF
switch 2
switch 2