Again, that sentence is unparseable by people in the real world.
Maybe tech workers have spent too much time in the tech world and forgot that terms like "SIP" and "POTS" are not really part of the language. Moreover, the mental model of understanding used to conceptualize the various bits of the phone system and how they interact is itself part of a specialized skill set. You can't get very far when you are, quite literally, thinking about it wrong.
And it's not just the idiots (although they certainly qualify), I've met tons of research academics, medical professionals, authors, historians whose make fundamental errors in how information systems work and are organized. They ask questions that I just have to answer with, "the fact that you ask this question means you have the wrong picture in your head already".
As an example, I once had a surgeon explain to me that his computer was not likely to be hacked because he always put it to sleep when he wasn't using it. I asked him what about the times it was awake, and he said that "well it can't be hacked because I'm using it at the time and only one person can be on the computer at once". Suffice it to say, I had to go down a few levels to explain things.
Or think of it this way -- he knows as much about computers and information systems as you know about orthopaedic surgery and the organization of the connective tissue in the body. :-)