I've called a dozen or more black bears, on purpose, with hand predator calls. Others have called a lot more. I'd sure give it a try.
You might want to judiciously cut some shooting lanes. Also, make sure that you can see downwind. That's by far the most likely place the bear will show up. Some hustle in noisy, and others sneak in. Some will come in a minute and some will take well over half an hour.
Exact sound doesn't seem too critical as long as it sounds like a critter small enough for a bear to eat and in distress that he can take advantage of. I like coarse jack rabbit/fawn sounds but lip squeaked one within 20 feet once when I didn't have a call along. If there is an area of heavy bear sign, set up nearby and call. I've called them in some pretty thick timber and brush, visibilty no more than 20 yards. Trouble is you usually don't get to look the bear over very well to decide size, etc. in such cover, and it can be hard to see cubs with a momma.
Most folks say call constant. I've done well with intermittment, call for 15-30 seconds with a minute or two of silence, but will call more frequently if I try it again. Let us know what happens.
Oops, just noticed you wanted experience with NC bears. Mine have been in Wa State, British Columbia and Saskatchewan. I'd expect them to come to a call in a similar fashion.