> "Can you hear me? I can't hear you"

Would you mind explain me why there isn't anything (or only little) done in that area? I guess we could implement some assistive checks for input and output audio streams? What is blocking us to implement a "handshake" that will verify that all is fine? - let's say communicators will send a recorded sample "Hello World" message over wire and check the microphone, volume, noise etc. In my opinion the pattern how we resolve the "I can't hear you" problem is a repeatable checklist that we more or less confidently do, so why we can't implement it as some algorithm that takes care of those problems in automatic way?