I feel lucky if I find CG or "Master" electrician's wiring that winds up with the white/brown pair intact.
Generally, I find line 1 on the Green/Orange pair, line 2 on the Blue/Brown pair, and all the white "neutrals" twisted together with a big wire nut.
If it's a house with 20 or 30 jacks, it can take all day to straighten the crosstalk out.
