NO. regarding your inquiry...not callers.
Guests are known people with reputations(LOL) in their various fields.
All sorts of people including UFO experts and spirit contacts(ghost busters)(LOL)...etc. are guests on the show over many years and previously and still on weekends with Art Bell as host.
Oh.
Thanks. I never listen to that program (I'm on the east coast, but I suppose it's available online....I can't get any radio stations here). Sounds interesting