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 Contact Center Enterprise Releases 7.0 and 7.1 SRND 
•Cisco Unified Communications SRND Based on Cisco Unified CallManager 5.x
•Cisco Unified Communications SRND Based on Cisco Unified CallManager 4.x
•Enterprise QoS Solution Reference Network Design, Version 3.3, November 2005 (right-click to download PDF)
•Cisco IPCC Express Edition Release 4.5 SRND (right-click to download PDF)
•Cisco Customer Voice Portal (CVP) Release 3.1 SRND
Additional SRND resources are available at this location: