Reptiles generally seem to be very quiet. How noisy do you think Paleozoic wildernesses were?
Since the earliest tetrapods and amniotes in the Late Carboniferous and Early Permian had little-to-no sense of hearing – at best they could detect low-frequency vibrations in air or through the ground – there wouldn’t have been much reason for them to vocalize. (I suppose there’s the possibility of infrasound calls, though, like some modern animals.)
But then better hearing systems started convergently evolving in the various major tetrapod groups around the Early-Mid Permian, so things probably began to get a little noisier. We may never know for certain which animals experimented with that type of communication, since behavior doesn’t fossilize, so it’s an exercise in speculation.
But I doubt it would have been all that quiet anyway, because there was another group of animals around who could have been making noise long before the tetrapods: insects.