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IP telephones that are reset unexpectedly might not access the appropriate upgrade and settings files. In this case, the telephones default to a mode which users can find unacceptable, such as having missing features or user-defined options.
Using either a protocol-specific access list or a general access list controls server access. You can also bypass these control mechanisms and force a default upgrade and settings back to the telephone. Doing so prevents the telephone from requesting more file downloads in these conditions.
The server checks for the existence of one of two files in the TFTP/HTTP/HTTPS directory
“fxd_upgrade.scr” and “fxd_settings.txt”.
When requesting the normal 46xxsettings.scr and 46xxsettings.txt files and access would otherwise be denied, the Avaya IP Telephone File Server Application server delivers the “fxd_xx....” files instead.
These files are expected to be programmed with parameters suited to the failure mode and conducive to just restoring basic telephone operation quickly. File examples are in the “docs” subdirectory of the application.
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