
It sounds like an encrypted RADIO system.
Money Heist Season 3, Episode 4

( QA responder
shouting over RADIO )
Westworld Season 2, Episode 7

MAN: (OVER RADIO):
ISS, Houston...
The Big Bang Theory Season 2, Episode 22

(MIMICS RADIO STATIC)
The Big Bang Theory Season 6, Episode 2

I've been to Radio Shack.
The Big Bang Theory Season 5, Episode 19