During installation, the phones request files first downloading an xxupgrade file from the file server. They then follow the instructions within that file to request further files if necessary. Various different xxupgrade files exist for the different phone series. These are provided as part of the phone firmware . The xxupgrade files should not be edited or changed in any way.
The last line of all the xxupgrade files instructs the phones to request the 46xxsettings.txt file. This file can be used to set site specific settings for all the Avaya H.323 IP phones being supported on a particular site.
When using the IP Office system as the file server, the IP Office system will auto-create a suitable 46xxsettings.txt file based on various IP Office system configuration settings. It will only do this if there is no actual 46xxsettings.txt file available on the server.