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How many Subscriber servers can be added to a UCM cluster?
- one
- two
- six
- 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 UCM cluster 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.
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