I think the "fair game" aspect with that is due to the fact that shows like Tradio were soliciting calls. I wouldn't be surprised if that's fake though
There’s dozens of hours of prank call compilations to Mike Franseca and have of them are caught on video. Sal and Richard are at least edited due to the fact that I doubt they would get three to four calls in a row. On the other hand, what kind of a loser calls into random public access shows to not fuck with them?