Clarification for my Mistake:
At one point it was Bill and Dick “doing” two chix over the phone (never done it so don’t ask me how, I guess it was a party line), so FOUR of them, and that’s why it was at the time described as “quadriphonic”.
But usually it was only Bill and Monica.
And Unit 8200 got it all recorded.
Now I’m sure their capabilities are just off the charts, compared to this dusty old stuff.
If I recall the story correctly, the story is that they tapped the main trunk cable that fed the phone lines into the entire city or something like that. From that they could hone in on the phone lines they were interested in listening.