This only applies to devices which are already running at least version 4.0.0 of the UCS firmware.
In previous versions (Polycom SIP software 3.x or earlier) this manual process was not available.
Legacy phone support has been implemented to allow easy migration from an existing phone system to 3CX without the need to directly replace all existing IP phones.
It is strongly recommended not to purposely buy these devices new or as a replacement.
The snippet you attached doesn't have much useful info.
Also, do you know if IP7000 requires any special config file/template? It will just take a little time, some elbow grease and some hardware.To start this off let’s begin with the brains behind it all: the TFTP server, also known as, Trivial FTP server.Also the firmware was packaged differently in the previous SIP versions as the device firmware was provided as two separate binary files, the bootloader image and the application image.In the 4.x UCS release these were merged into the same binary file.