In the Plan phase, you evaluate Cisco technologies that address your business needs and create a business case for the IP telephony system that provides the best return on your investment.
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Before You Begin
Understand the features and functions of IP telephony applications. Start with the Planning Concepts and the System Release Notes for Small and Medium Business 
. Then, review the deployment models to understand your options.
When You Are Done
You have defined and created the following:
•Your business and system requirements
•A list of components and applications that match the requirements
•A project plan based on those requirements including a proposed, high-level design
Major Concepts and Tasks in This Process