Couple of notes:
-- You need communications software that emulates a TVI925 or TVI950 terminal in order that screens paint properly. Without this emulation, you'll only see junk.
-- The F screen is the most valuable resource for a cutover - shows what extensions are assigned to which physical ports. If you're using Avaya digital stations, it makes the cut much easier. Take a screen shot of it.
-- The H screen allows list and set commands for various system details. See manual for specifics - but an example is: List phone type M64 - will show all extensions with Model 64 phones. List day ring 001 shows the extensions that ring on line 1, etc.
-- Digital phones are all four-wire, most station cards are 12 port. If it has a pre-made frame, the stations go down the left side, four wires then skip a pair, and continue down center set of stitches. Next card begins on lower half of middle pins and continues down right side.
Good luck