Device Firmware Updates Overview
Device firmware loads are files that contain updated firmware for devices. The four types of firmware loads are phone loads, gateway loads, media termination point (MTP) loads, and conference bridge loads. During installation or upgrade, Cisco Unified Communications Manager provides the latest loads; however, you can also receive a load between releases that contains patches or other information that is important to the devices, such as phones or gateways.
The /usr/local/cm/tftp subdirectory stores these load files with a .bin, .zip, or .sbin extension. During installation or upgrade, this location stores the latest loads. To use new loads that you received between releases, you must copy the loads to this location so that the system can access them.
Before endpoints can upgrade to a new version of software, the files required by the new load must be made available for download at a location the endpoints have access to. The most common location is the Cisco UCM node with the Cisco TFTP service activated, called the "TFTP server". Some phones also support using an alternate download location, called a "load server".
You can apply a new load to a single device before configuring it as a systemwide default. This method is useful for testing purposes. Remember, however, that all other devices of that type use the old load until you update the systemwide defaults with the new load.