1. The Design Process—Planning
Understanding Infrastructure Considerations

2. Infrastructure Considerations
All Cisco Unity designs and deployments are shaped by three infrastructure considerations:
Messaging
Telephony
Networking
Type
Fact
Intro
This topic explains that all Unity designs are shaped by infrastructure considerations, capacity planning considerations, and deployment considerations.
Content
Unity designs will all use an existing infrastructure or an infrastructure that is created and dedicated for Unity. For any Unity design to function properly, designers must consider infrastructure, capacity planning and deployment requirements. Failure to comply with these requirements could and often does severely impact the performance of Unity.

3. Messaging Infrastructure Considerations
Microsoft Exchange or IBM Lotus Domino?
Exchange routing and administration groups
Cisco Unity to use same domain controller and global catalog servers as Exchange 2000 or 2003
Domains and organization unit containers in which mailusers are located for Cisco Unity service account permissions
In a Domino installation, operating system on Domino servers, Lotus DUCS
Interoperability with another voice-messaging system?
Client desktop operating system
Cisco Unity logical survey

4. Example: Messaging Infrastructure
Exchange
2000 DC
DDNS
WAN
Cisco Unified
Call Manager1
Workgroup
Call Manager2
DC/GC
DDNS
DC/GC
DDNS
Cisco Unity

5. Telephony Infrastructure Considerations
IP or circuit-switched PBX ?
Physical placement of Cisco Unity (reminder)—
PBX-Cisco Unity placement could be an issue.
Telephone system maintenance
Dial plans overlapping?

6. Networking Infrastructure Considerations
Name resolution or DNS
Firewalls
Gateways available for Cisco Unity to reach resources
VLANS—Cisco Unity on data VLAN
Bandwidth
Minimum 100-Mbps connection
Maximum 200-ms network latency
Failover recommended 100-Mbps connection between primary and secondary servers

7. Example: Networking Infrastructure Considerations
Headquarters
Exchange 2000 DC
DDNS
WAN
WAN
Cisco Unified
Call Manager1
Workgroup
Call Manager2
Internet
Internet
DC/GC
DDNS
Exchange 2000
DC/GC
DDNS

8. Summary
All Cisco Unity designs are shaped by three infrastructure considerations: messaging, telephony, and network.
Cisco Unity will rely on the same domain controller and global catalog as the Exchange servers.
Physical location and interoperability and flash-cut could be telephony issues.
Network infrastructure issues include name resolution, access to network resources through gateways, firewalls, and bandwidth.
The Cisco Unity logical survey will help identify these issues.