CallManager Role Description
Database publisher server Makes all configuration changes, and produces
call detail records.
TFTP server Handles downloading of configuration files,
ring types, and device operating code.
Application software server Software installed adds features to the IP
telephony solution.
Primary call-processing server Responsible for call-processing functions.
Backup call-processing server Responsible for call-processing functions.
Each CallManager in the server may be assigned one or more of these roles,
but there is only one database publisher server, and one Trivial File Transfer
Protocol (TFTP) server per cluster.You must decide on the level of redundancy
and processing distribution required in your installation. For larger installations
it is recommended to split the database publisher server and TFTP servers onto
different servers.