Cisco Systems OL-14619-01 manual Option, Considerations, 6-12

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.

Table 6-2 Options and Considerations for Integrating with Multiple Cisco Unified

Communications Manager Clusters

Option	Considerations
Create a new Cisco	•	This is the recommended method.
Unified CM integration for	•	Each Cisco Unified CM integration handles the MWIs for the
each new Cisco Unified CM
		cluster. Dedicated MWI ports for each Cisco Unified CM cluster is
cluster
		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	•	You must assign at least one MWI port dedicated to each Cisco
existing Cisco Unified CM		Unified CM cluster that you add.
integration for each new	•	The first cluster in UTIM will handle all calls and direct them to the
Cisco Unified CM cluster
		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.

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.

	Design Guide for Cisco Unity Release 5.x
6-12	OL-14619-01