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 for small and medium businesses:
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Smart Business Communications System Design Guide 
•Smart Design: Unified Communications 2.0
•Cisco Unified Communications Manager Express Solution Reference Network Design
•Cisco Unified Contact Center Express SRND Release 7.0
•Cisco Unity Express Solution Design
Note Additional SRND resources are available at http://www.cisco.com/en/US/netsol/ns742/networking_solutions_program_category_home.html .