This doesn't go into any detail about how 'caller ID' works. It just goes over how the information is stored…
"I'll get into these points more later on, but it's important to understand what is happening."
I assume the author will be adding and updating this over time. This may just be a start.
Yes, I read the continuation… the title's just completely misleading. "How Caller ID works" … "oh, I'll tell you in another post please subscribe lolz also see OpenCNAM my paid caller id project"