How many Subscriber servers can be added to a UCM cluster?
A.
one
B.
two
C.
six
D.
eight
Explanation:
A Cisco Unified Communications Manager (UCM) cluster can support up to eight Subscriber servers.
Subscriber servers typically handle call routing, dial tone, receiving digits, and the streaming of on-hold music in
a UCM cluster. In medium to large environments, the Subscriber servers perform most of the work in
connecting and maintaining calls so that the performance of the Publisher server is not hindered. A UCMcluster is an environment that contains a Publisher server and up to eight Subscriber servers. Each server in
the UCM cluster has a unique configuration.
The Publisher server in a UCM cluster has two roles. It holds the master writable copy of the IBM Informix
database for the cluster, and it acts as a Trivial File Transfer Protocol (TFTP) server for IP phone configuration
downloads. The Publisher server is the only server that contains a writable copy of the IBM Informix database
that stores directory numbers (dns), calling permissions, route plans, and other information. The Publisher
server replicates the data that is stored in the master database to the Subscriber servers, all of which then store
their own read-only copies of the database.
A Cisco Unified Presence (CUPS) server cluster can support up to six servers. CUPS is server software that
centralizes network traffic from several different communications services so that it can all be transmitted over
the same Cisco Voice over IP (VoIP) network. CUPS uses industry-standard Jabber XCP for communication
between different instant messaging (IM) clients; Extensible Message and Presence Protocol (XMPP) is the
protocol that establishes the IM sessions. In addition, Jabber XCP facilitates other features such as file and
application sharing and video conferencing.Cisco: Cisco Unified Communications System 8.x SRND: Call Processing Architecture