Yealink IP Phones Auto Provisioning Guide12new downloaded configuration files will override the duplicate parameters in filesdownloaded earlier. “overwrite_mode = 1” means overwrite mode is enabled. The overwrite mode will beapplied to the configuration files specified to download. This parameter can only be usedin boot files. Overwrite mode includes the following features:- The NULL values take effect (if the value of a parameter in configuration files is leftblank, the factory default value can take effect.)For example, the label for account 1 is “abc”, and the value of the parameter“account.1.label” is left blank in the configuration files (e.g., account.1.label = oraccount.1.label = “”). The factory default value Blank takes effect after autoprovisioning. So the label for account 1 will be deleted.- The deletions of the configuration parameters take effect (if a parameter inconfiguration files is deleted, the factory default value can take effect immediately.)For example, account.1.enable = 1 is deleted or commented out in the configurationfiles. The factory default value 0 takes effect after auto provisioning. So account 1 isdisabled. Note that if a boot file is used but the value of the parameter “overwrite_mode” is notconfigured, the default value 1 will take effect. If you want to disable the overwrite mode,configure “overwrite_mode = 0” in the boot file.NoteCreating MAC-Oriented Boot FileThe MAC-Oriented boot file is only effectual for the specific phone. It use the 12-digit MACaddress of the IP phone as the file name. For example, if the MAC address of the IP phone is00156574B150, the MAC-Oriented boot file has to be named as 00156574b150.boot(case-sensitive) respectively.The IP phones try to download the MAC-Oriented boot file first from the server during autoprovisioning first. If no matched MAC-Oriented boot file is found on the server, the IP phonestry to download the common boot file.If you want to create a MAC-Oriented boot file for your phone, follow these steps:Overwrite mode only affects the non-static settings configured using configuration files.If you do not use the boot file for auto provisioning, overwrite mode is disabled by default andyou are not allowed to enable it.