Connecting Cisco 8800 series phones

Having configured a TrixBox with ISDN BRI back in the day, I thought I had this covered, but apparently not. And I’m sure it has been asked a million-and-one times, but I just cannot find what I need: Could somebody please help me connect my Cisco 8865, 8851 and 8845 phones?

I have freshly installed RasPBX on a Raspberry Pi 5 with 16GiB of RAM using this excellent guide. I have installed a tftp server on it too, and my pfSense router is adding its IP address as a DHCP option. The .xml file seems to be loaded by the phone, but it’s just not registering.

I have many questions, but let’s start with this: Should I patch Asterisk with the patches from usecallmanager.nz?
4 Out of the 5 phones I have 3PCC firmware installed, the remaining 1 runs CUCM firmware.

Any help is greatly appreciated.

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