What headset would you recommend in extreme situations

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What would you recommend if I someone had a job where I need to be able to hear people crystal clear, even when they’re intentionally diluting or muffling their voice or the sound on their end using various softwares and using heavy systems such as a VC and VPNs and several other things that disrupt the quality of the call and have crappy, outdated devices and hardware, I’m talking like if a person still have the iPhone 4 or is unironically still using an emachine computer