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Make no mistake, the show is scripted. The callers are all off-stage and are not a variable part of the show. One of my favorite entertainers - Christine Pedi - creates many of the voices. Actually there are 5 callers and they run the gamut of voices and personalities. On stage, there is a small supporting cast, including Stephanie March (ADA Alexandra Cabott - Law and Order SVU).
There was certainly an intensity to the performance - staged as if in a studio - with working microphones, hence the "deep radio voice" is broadcast to the audience as if we were actually listening to the radio.
The show, written by Eric Bogosian (SubUrbia, Law and Order CI) 20 years ago, doesn't seem to "shock" as much as it probably did 20 years ago. Today we're all used to Howard Stren and the likes. Yet there is a timeless story buried beneath the surface - the story about how Hollywood and the Media can make a star out of a character and how that real person and life behind the character can transform - or be transformed - by the circumstances.
My mother used to tell me not to believe everything I read. I'd consider extending that to everything you hear, too.