CallManager 3.x
CallManager is currently in release version 3.1.The CallManager 3.x release
introduces several enhancements over the previous 2.x version of the software.
Version 3.x is built on the Microsoft Windows 2000 Operating system, whereas
version 2.x was built on Windows NT 4.0.Version 3.x utilizes a Microsoft SQL
server database for data warehousing, while previous versions of CallManager utilized
a Microsoft Access database, which severely limited the scalability and reliability
of the platform.An important note to make, though, is that CallManager
still fails to support other database systems such as Oracle.
CallManager 3.x allows up to 2500 IP telephones to be supported by a single
CallManager server, up from CallManager 2.x’s limit of 200 IP telephones per
server. Another enhancement the 3.x version of CallManager offers is increased
reliability and scalability by use of a feature known as clustering. Clustering allows
multiple CallManager servers to be interconnected, in order to service more IP
telephony devices and to provide redundancy.