Solution Reference Network Design (SRND) documents provide guidelines, recommendations, and best practices for implementing enterprise networking solutions.
The following SRNDs are recommended for designing Cisco Unified Communications systems:
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Cisco Unified Communications SRND Based on Cisco Unified Communications Manager 6.x 
•Cisco Unified Communications SRND Based on Cisco Unified Communications Manager 5.x
•Cisco Unified Communications SRND Based on Cisco Unified CallManager 4.x
•Cisco Unified Contact Center Enterprise SRND Release 7.x
•Cisco Unified Contact Center Express SRND Release 5.0
•Cisco Unified Customer Voice Portal SRND Release 4.x
•Enterprise QoS Solution Reference Network Design
Note Additional SRND resources are available at http://www.cisco.com/go/srnd .