Used to be able to look at a bunch of cables running across a ceiling and say "there is a voice cable and there is a data cable." Now it's anyone's guess.
Yeah. They could be audio, video, thermostat, doorbell, security, lighting- CAT 5e and now CAT6 has become the universal low voltage cable that any hack can buy at Home Depot and every sparkie uses to make a mess everywhere.
-Hal