All of the PSTN drops (and feeds) terminate on split 66-blocks, here.
*I* can keep track of what goes where with a legend accessible nearby. But, I'm concerned as to how a future homeowner would deal with this (not a common site in most homes!).One approach is to just sequentially *number* each contact pair and document the role on the legend.
Another approach is to treat each "group of pairs" for a particular drop/feed as a "unit", documented as such. This might be more intuitive for a neophyte ("Ah, the SE Dining Room drop is wired to feed #3!").
I'm covering the pins with a transparent cover to keep things pretty *and* act to confine the conductors (fancy insulator, of sorts). I could put the labels on that cover (which means the labels are removed when you access the pins). I'm not fond of "Sharpie-on-fins" labeling (it always looks tacky). And, the slide/clip on labels would be mutually exclusive with the transparent covers I want to use.
Note that the fins carry some inherent "keying" (groups of 10). Or, I could use two colors to mark alternating groups of fins (this group is one drop/feed; the alternate color marks the group for the next drop/feed) and count on the color codes of the individual conductors to further "document" what each does in a group.