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3-3
Design Guide for Cisco Unity Release 5.x
OL-14619-01
Chapter 3 Network Infrastructure Requirements
Using Firewalls with Cisco Unity
during installation. If Cisco Unity subscribers are homed on servers other than the partner Exchange
server or the Domino mail drop server, all voice messages from outside callers pass through the partner
server or the mail drop server on their way to the home servers for Cisco
Unity subscribers.
When the partner Exchange server, the mail drop Domino server, or a message store server on which
Cisco
Unity subscribers are homed is unavailable, Cisco Unity functionality is affected in the following
ways:
• Messages from outside callers are stored on the Cisco Unity server in the Unity Message Repository
(UMR), and can be retrieved during the outage. However, voice messages that were previously
received by subscribers are not available until the home server is back online.
• When the home server of a calling subscriber is down, any messages from that subscriber are stored
on the Cisco
Unity server in the UMR, and can be retrieved by the recipient during the outage.
• Message waiting indicators and message notification will not work.
Tip Make sure that the importance of message store availability is clearly understood prior to installing one
or more Cisco Unity servers, particularly those that service message stores on separate servers.
Using Firewalls with Cisco Unity
Revised May 6, 2008
Cisco Unity can coexist with firewalls. However, note that Cisco Unity should never be deployed outside
of a firewall. Doing so can expose the Cisco
Unity server to unwanted intrusion from the Internet, even
if the server is hardened.
For detailed firewall requirements, see the following sections in the System Requirements for
Cisco
Unity at
http://www.cisco.com/en/US/products/sw/voicesw/ps2237/prod_installation_guides_list.html:
• “Network Requirements”
• “Failover Requirements for Separating Cisco Unity Servers by a Firewall”
• “Standby Redundancy Requirements for Separating Cisco Unity Servers by a Firewall”
Sizing and Scaling Cisco Unity Servers
When sizing a Cisco Unity server, follow these guidelines:
• Maximum Number of Users on Dedicated Domino or Exchange Servers, page 3-4
• Storage Capacity for Voice Messages, page 3-4
• Number of Voice Ports, page 3-4
For a list of servers that meet Cisco Unity specifications, see the Cisco Unity Supported Platforms List
at
http://cisco.com/en/US/products/sw/voicesw/ps2237/products_data_sheets_list.html.