That goes double for telephone wiring. Spent much too long trying to get the livingroom phones reconnected after the plumbers managed to disconnect the old outside wiring that I shouldn't have been using anymore anyway. What I have now is a totally jury-rigged piece of junk, but it at least works well enough to provide a dialtone. On the correct line, which was the most recent in a long chain of problems.
At least the two Cat-5 cables from the livingroom to the server closet were intact; would have been much harder if I'd had to replace them.