So let's start with the cards

The MCP is the main card runs the system
Misc3 would be for call display and has a small cable that plugs it into the MCP card
SVMI 4 provides the auto attendant/voicemail 1 per system
6TRK is for connecting analog Bell lines and 8 DLI supplies 8 digital extension ports for the phones. The main cabinet will also have 8 built in digital extension ports so you can have up to 16 digital phones connected.

If you have a phone that's showing just the version number there are a couple of possibilities
1) Bad phone you can confirm that by swapping with a known working phone
2) Bad dli port try a different port
3)Not connected to a dli port I think even connecting to an outside line with 48V on it will show the version on a phone

To be honest I like this system and except for power supply known issues ,it works fine