Administrator's Guide

1-3
Cisco Unified Attendant Console Administration and Installation Guide
OL-27293-02
Chapter 1 Product Overview
Features
The two servers are linked using Apache Active MQ, an open-source message broker. When you update
system and user configuration on the Publisher, all the changes are sent to the Subscriber in real-time.
If the Publisher fails the Attendant Console client applications automatically log out and offer their users
the option to continue connected to the Subscriber.
Apache Active MQ is also used for real-time synchronization of operator and queue availability. It also
enables the Publisher and Subscriber to detect whether the other has failed.
The Publisher and Subscriber servers can be part of a Microsoft Domain, so long as they can access each
other by hostname. Call Forwarding is used to transfer calls to the Publisher Queue DDI numbers to the
Queue DDI numbers of the same queue on the Subscriber.
Note If the inter-server communication link is down, all online updates will fail. This is also true of the
non-resilient version of Cisco Unified Attendant Console Advanced.
To check the status of the inter-server communication link:
1. Log in to Cisco Unified Attendant Console Advanced Administration and choose Engineering >
Service Management.
2. View the activity and status of the Cisco Unified Attendant Server.
If the Inter Server Communication Status is Suspended, the ActiveMQ service may not be running.
To check and restart the ActiveMQ service:
1. In Control Panel, click Accessories, and then click Services.
2. If the Status of the ActiveMQ service is blank (meaning that it is stopped), select the service and
click Start.
3. Use Cisco Unified Attendant Console Advanced Administration to confirm that the Inter Server
Communication Status is Normal.
You can install Cisco Unified Attendant Console Advanced as a single-server (Publisher-only) system,
with no resilience. If you install Cisco Unified Attendant Console Advanced as a non-resilient system,
you can convert it to the resilient version by purchasing and installing a resilience license. When you
install Cisco Unified Attendant Console Advanced as a Publisher-only system, if no SQL Server is
detected then SQL Server Express Edition is automatically installed on the server; you will also need to
upgrade SQL Server to the Standard or Enterprise edition if you want to convert to a resilient system.
For a resilient installation you must first install the Publisher server and then the Subscriber server (the
Subscriber installation communicates with the Publisher). When you have installed a Publisher or
Subscriber server you cannot convert it into the other server type. The Publisher requires at least SQL
Server Standard to be installed, while the Subscriber can use SQL Server Express (which is installed
automatically when you install Cisco Unified Attendant Console Advanced, if no version of SQL Server
is already installed).
Resilience Provided
The system is resilient to the following failures:
• Cisco Unified Call Manager node failure (partial failover). During normal operation, the primary
Cisco Unified Attendant Console Advanced server on the Publisher server and the secondary Cisco
Unified Attendant Console Advanced server on the Subscriber server connect to different CTI
Managers within the same Cisco Unified Communications Manager cluster. For more information
about CTI Manager, see AXL Usage During Installation, page 1-6. If the Cisco Unified