Once you load the package, all binary files are stored on the TFTP server. A package usually contains multiple binary images that are used by the phone. For binary images that the TFTP service provides you must load or install a package containing the appropriate firmware loads. In addition the TFTP service is responsible for generating configuration and security files. The role of the Cisco TFTP service is to serve files such as firmware images to requesting services or end points. I typically recommend having two TFTP services in the cluster and I prefer not to run this service on the Publisher or call processing nodes in larger environments. non call processing services) to the cluster and its endpoints.
Depending on the size of your deployment, you may have this service running on the Publisher node or multiple nodes dedicated to providing supplementary services (i.e. The Cisco Unified Communications (CUCM) solution architecture has a TFTP service that you enable on one or more servers in a given cluster.
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