CallManager is the centerpiece of Cisco's entry into the world of telephony.

• CallManager is implemented as a set of services that run on a Microsoft Windows 2000-based server.
• Configuration data is stored in a Microsoft SQL database.
• The administration interface is implemented using HTML, JavaScript, and Java applets served up using Microsoft's IIS. Even though the administration interface does not appear to use ActiveX, you must use Internet Explorer to configure CallManager.
• Multiple CallManagers can be clustered to provide higher availibility.

Here are some links to more information:

• Integrate with Asterisk|How to integrate Cisco CallManager and Asterisk

• Cisco Call Manager consultants