This case study documents the steps that were taken to in order to mitigate the risks and address several vulnerabilities associated with an implementation of the Cisco Call Manager (CCM) within a new Voice over IP environment. The original Voice over IP network architecture, a high-level vulnerability and risk assessment of the CCM and the planning and design of an improved Voice over IP network architecture are all addressed within this document. The CCM is a server based on Microsoft Windows 2000 and the MS SQL Server 2000. All of the vulnerabilities, risks and many of the same threats that apply to most any Microsoft Windows 2000 server also apply to the CCM.
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