Cisco Cisco IP Contact Center Release 4.6.1 Installation Guide

The side B Router requires successful connectivity with greater than 50% of the 
configured Peripheral Gateways (PGs).

Upgrade the Key Admin Workstation(s)

Key Admin Workstations must be upgraded with the first side of the Central 
Controller to be upgraded. This is so complete testing can be completed prior to 
upgrading the second side of the Central Controller. 

A Key AW, from a demographics view, is simply the AW used for system 
administration located near the Central Controller being upgraded.

Admin Workstations must be at the same version as the Central Controllers in 
order to work properly. Due to this, once the Central Controller side with the 
upgraded software is brought online, any AWs left at the older version of software 
should be shut down to avoid continuously attempting to connect to the upgraded 
Central Controller. Continuous re-connection attempts are eventually refused, but 
in the interim cause unnecessary overhead on the Central Controller and the 
network.

No configuration changes are allowed during the upgrade process. Any 
configuration changes must wait until the upgrade is complete.

Side A CallRouter and Logger are upgraded to the new level of software. 
However, upon completion of the upgrades and reboot of machines, the Logger 
and CallRouter Services are not started. The upgrade steps include setting all ICM 
services to manual before proceeding with the upgrade.

Stop Central Controller side B. ICM Central Controllers cannot run in duplex 
mode unless the software levels on sides A and B are identical. Therefore, side B 
Central Controller must be stopped before the side A Central Controller is started 
at the new/upgraded software level.