> They probably do both... beam spliters are nice, for when you don't even want the telco to know. They are way past bothering to hide what they do. Decades ag

> They probably do both... beam spliters are nice, for when you don't even want the telco to know. They are way past bothering to hide what they do. Decades ago they were happy to march right into a telco's headquarters and take over parts of their facility for their own use and then set up splitters. https://en.wikipedia.org/wiki/Room_641A https://en.wikipedia.org/wiki/Room_641A