I would just add that when interpreters are straining to hear, if somebody is connecting by phone or a cellphone from the back of a car, they turn up the volume. In cases where there is feedback—that screech you hear, as you know, when you get too close to the microphone with your phone—the volume is up, the headsets are on and that goes straight into the brain of the person who is trying to interpret you.
On May 4th, 2020. See this statement in context.