How is the president’s phonelines/internet pro…

I was watching an interesting History documentary on the US government last night. In some scene they mentioned the president’s desk phone and accompanying cell phones are custom-made for special security.

This made me wonder, how safe exactly is it? I’m not asking how difficult it would be to crack or anything of that nature. But would it be possible to mimic that level of protection or nah?

I realize a lot of it probably isn’t even known. So if you had to take your best guesses…how would the president’s communication lines privacy be protected?

Found here