I have my two OPII panels terminated at the distal sides of the zones. Personally I have seen two "camps" relating to terminations with resistors. The blue and white cables maybe daisy chained loops or zones (IE: windows and doors for one room being one zone looped in the panel?) The "off white" cables appear to be definitely cat5 (or cat5e) wires with 4 pairs (8 wires) and the white ones definitely appear to be 2 pair (4 wires). You could also label them one by one which would help you with your endeavor. You could do this with just a VOM and some alligator clips. The time consuming pieces really were just tracing the wiring and replacing a bunch of NC/NO switches and checking on the terminations (new resistors). The actual wiring pieces to the OPII panel only took maybe one hour or less connecting each zone one by one and using PCA to validate each zone. It took me two days all day to do the wiring for the neighbors HAI panel. A bit time consuming but it will be worth your efforts. If the panel is not being utilized right now for anything then I would trace each of the wires one by one. I never assumed that the smokes LV wiring would have been in the boxes above the smokes as that is a really not to any code that I know of but maybe sitting loose above the boxes somewheres and maybe labeled? Or they could be just sitting in a bundle above the alarm panel in the attic. The 2 pair (4 wires) look to be of a thicker guage same though guage as the cat5e wiring.
Looks like the wiring guy mixed all of it together (smokes too?). The blue and white wires could be loops related to zones. It does not appear to be plenum rated from what I can tell. Looking at your picture the cat5e appears to be of the older type with easier to see colored wires. It was really a bit of a fire hazard and it didn't make sense to me other than maybe it was done on the "cheap", non qualified installer and quickly? I put an electrical box in the wall redoing the HV wiring such that it went into the wall and into the box. The installer had literally pulled electric down from the attic leaving the bare wires and wrapping them around the terminals of the alarm panel transformer then putting black tape on this setup. Thing that really bugged me was it was really a mickey mouse set up.
I redid the roomed loops and ended up with about 6 zones. I removed and disconnected all of the cabling tracing each wire one by one back to the panel. That said I noticed that the wiring loops were done in the rooms in the ranch style home. I helped a neighbor in Florida replacing and installing a new Omni Pro II replacing their legacy panel a few years back.
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