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I'm told that almost all radio guests, even the ones who sound like they're in the studio, are actually over digital phone lines
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Not just the guests. You've heard of the radio duo Opie and Anthony (now defunct). For the last few years of the show, Anthony was doing the show from his house in another state.
In most locations, the only lines that are not digital are the ones in the house. It's analog to connect to the old-style phones, but when they get to the box that connects to the phone network, usually in the basement, it goes digital right through to the destination where a similar conversion can take place.