Even though I actually worked for a telecom company in 1999 as my first programming job, the telecom stuff has always been mysterious.

Even with everything being voIP now it still feels mysterious.

So I still can’t wrap my head around what happens when you go from a Twilio api call to the cell tower and ultimately the handset.

Are these guys claiming that the software does all that?

In which case, how do I hook into the carriers and telecom infrastructure?

Would Verizon give me an IP to connect to? Which protocol?