Earlier quoted context omitted.
I’m totally ignorant here, so I’m sure there’s a good reason: why is secure caller id so hard?
The telephone network was designed with total trust for “network operators” who essentially have “root” to do anything. This worked OK when the only operators were the various national phone monopolies (Cap’n Crunch notwithstanding), but today that level of access is much easier to get and abuse, and is difficult to trace. There are efforts to bolt-on security to the telephone network but it’s really hard. I think it…
I assume you mean Captain Crunch, not the breakfast cereal... :-)