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 Communications Manager Express Solution Reference Network Design
•Enterprise QOS System Solution Reference Network Design Guide
Note Additional SRND resources are available at http://www.cisco.com/go/srnd .