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up to three redundant CUCM servers for failover purposes. If the primary server is down,
it uses the secondary. If the secondary is down, it uses the tertiary. Because your CUCM
cluster can support up to nine call processing servers (one Publisher, up to eight Sub-
scribers), you can manually load balance the IP phones by assigning different primary, sec-
ondary, and tertiary CUCM servers to different groups of phones.
Note: A common mistake when first learning CUCM functions is to confuse the primary
server with the Publisher database role. Remember, the main goal of the Publisher is to
maintain the writable copy of the database. It will most likely not be the primary server of
an IP phone (except in very small environments). One of the Subscribers will be the IP
phone's primary server.
Key
To p i c
Understanding Cisco Unity Connection
Long before the Cisco “unified” product campaign, there was the Cisco Unity product.
Although most people identify Cisco Unity as “the voicemail solution” for your VoIP net-
work, Cisco designed it to be much more. The term “Unity” related to messages: voice
messages for sure, but also e-mail messages, fax messages, instant messages...you get the
idea. The goal of Unity was to make any message retrievable from any voice-enabled de-
vice or application. For example, a caller could leave a voicemail that you could retrieve
from an e-mail client inbox. You could listen to your e-mails from a mobile device or have
them faxed to an offsite fax machine. Essentially, regardless of how a message was left,
you could retrieve it using a variety of clients.
Just as the original Cisco CallManager software, the original Cisco Unity ran on a Mi-
crosoft Windows OS and used the Microsoft Exchange e-mail server solution as a mes-
sage store for voicemail. Cisco introduced Unity Connection as a smaller alternative using
the same appliance-based model as CUCM years after the original Cisco Unity release. As
time passed, support for Cisco Unity Connection grew so much that it surpassed the orig-
inal Windows-based Unity platform and is now the more popular and scalable solution.
Table 2-4 depicts the various voicemail solutions you can use for your IPT network and
their scalability limits.
Table 2-4
Cisco Voice Messaging Systems Comparison
Platform
Maximum Mailboxes
Platform
Redundancy
Cisco Unity Express
300
Router
Not supported
CUCM Business Edition
500
Appliance
Not supported
Cisco Unity
15,000 per server
Windows Server
Active/Passive
Cisco Unity Connection
20,000 per server
Appliance
Active/Active
In addition to supporting more mailboxes, Cisco Unity Connection now supports features
(such as personal call transfer rules and speech recognition) that are not available in the
other Cisco voice-messaging products.
 
 
 
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