CallManager is the centerpiece of Cisco's entry into the world of telephony.
As of June 2009, Cisco has released version 6 of their CallManager
CallManager version 5+ is now running on Linux RedHat
CallManager version <5 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.
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