Cisco has developed a variety of Unified Communications site models to use as standard architectures. Each site model was installed, configured, and tested with hardware and software designed for maximum efficiency and performance. You can derive your network design by choosing the site model that most closely matches your infrastructure and then adding the specific features and applications that meet your business needs. Where your requirements are different, do a risk analysis. See Using SRND Documents to help you with your design decisions.
The following information is available for IP Telephony site models tested during this Unified Communications System release:
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Tested Deployments and Site Models 
•Multisite Distributed Deployment Options