sections provide information about
Unified Communications Manager and the
Presence Service, and the relationship between these nodes when they
are installed together in a cluster.
About Cisco Unified Communications Manager
Cisco Unified Communications Manager serves as the software-based call-processing component of the Cisco Unified Communications family of products. A wide range of Cisco Unified Computing System (UCS) servers provides high-availability server platforms for Cisco Unified Communications Manager call processing, services, and applications.
About the IM and Presence Service
IM and Presence, which is a service of Cisco Unified Communications Manager, provides native standards-based dual-protocol enterprise instant messaging (IM) and network-based availability as part of Cisco Unified Communications. This secure, scalable, and easy-to-manage service offers users feature-rich communications capabilities both within and external to the enterprise.
About the System
provides an overview of the system topology and describes the relationship
between the types of nodes in the topology.
Clusters provide a
mechanism for distributing call processing and database replication among
multiple servers. They provide transparent sharing of resources and features
and enable system scalability.
comprises a set of
Unified Communications Manager (Unified Communications Manager) nodes
Presence nodes that run compatible software versions.
Nodes and Subscriber Nodes
Within a cluster,
there is a database publisher for each type of node that you install.
When you install
Communications Manager, the installation wizard prompts you to
specify whether the node you are installing is the first node in the cluster.
Communications Manager node that you install becomes the publisher
node, because it publishes the voice and video database to the other
Communications Manager nodes in the cluster. All subsequent nodes in
the cluster are called subscriber nodes. Each subscriber node must be
associated with the publisher node. You must set up all subscriber nodes in the
system topology on the publisher node before you install the software on the
When you install
Presence nodes, the first node that you install functions as the
server for the
Presence database. Because this node publishes the database for all
Presence nodes in the cluster, it is referred to as the
Presence database publisher; however, you must install this and all
Presence nodes as subscribers of the
Communications Manager publisher node. As with other subscriber
nodes, you must add these in the system topology before you install the