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Design Guide for Cisco Unity Release 5.x
OL-14619-01
Chapter 6 Integrating Cisco Unity with the Phone System
Integrating with Cisco Unified Communications Manager (by Using SCCP or SIP)
Integrating Cisco Unity with Multiple Cisco Unified Communications Manager
Clusters
To integrate Cisco Unity with more than one Cisco Unified CM cluster, you can just re-run the
Cisco
Unity Telephony Integration Manager, or UTIM. Note the options and considerations detailed in
Table 6-2.
Within a cluster, it is important to identify the backup (secondary) Cisco Unified CM servers so that
Cisco
Unity can connect to it if the primary Cisco Unified CM server becomes unavailable.
Cisco Unified Communications Manager Authentication and Encryption for
Cisco
Unity Voice Messaging Ports (SCCP Integrations Only)
A potential point of vulnerability for a Cisco Unity system is the connection between Cisco Unity and
Cisco Unified Communications Manager. Possible threats include:
• Man-in-the-middle attacks, in which an attacker intercepts and changes the data flowing between
Cisco Unified
CM and Cisco Unity voice messaging ports.
• Network traffic sniffing, in which an attacker captures phone conversations and signaling
information that flow between Cisco Unified
CM, the Cisco Unity voice messaging ports, and IP
phones that are managed by Cisco Unified
CM).
• Changing the call signaling between the Cisco Unity voice messaging ports and Cisco Unified CM.
• Changing the media stream between Cisco Unity voice messaging ports and endpoints, for example,
phones or gateways.
Table 6-2 Options and Considerations for Integrating with Multiple Cisco Unified
Communications Manager Clusters
Option Considerations
Create a new Cisco
Unified
CM integration for
each new Cisco Unified
CM
cluster
• This is the recommended method.
• Each Cisco Unified CM integration handles the MWIs for the
cluster. Dedicated MWI ports for each Cisco Unified
CM cluster is
necessary only if the Cisco Unified
CM integration has multiple
clusters in UTIM.
• Cisco Unity sends each MWI request directly to the Cisco
Unified
CM cluster on which the subscribers is homed.
• Multiple Cisco Unified CM integrations can be used with multiple
UTIM clusters on a Cisco
Unity server.
Add a cluster in UTIM to an
existing Cisco Unified
CM
integration for each new
Cisco Unified
CM cluster
• You must assign at least one MWI port dedicated to each Cisco
Unified
CM cluster that you add.
• The first cluster in UTIM will handle all calls and direct them to the
Cisco Unified
CM cluster on which the subscriber is homed.
• You can create an unlimited number of clusters in UTIM to a Cisco
Unified
CM integration.
• Multiple UTIM clusters can be used with multiple Cisco
Unified
CM integrations on the Cisco Unity server.