Hello Ratmir-MZ,
I am also having the same problem, not only on DAYZ, but also Arma. I am able to hear others, yet no one can hear me at all; same exact description down to the "microphone does not respond to the voice and the voice threshold indicator (volume) does not move from the place."
This has never happened upon first getting the game(s), however I have switched microphones within the 2 year timeframe I have been on PC in general. I prefer to use HyperX brand headphones, more specifically, HyperX Cloud II. On my first headset, which was the HyperX Cloud Wired, it worked perfectly fine; however, I now own Hyper X Cloud 2 Wireless, and I believe this is when I began to first experience this issue. On the other hand, I have done quite a few system modifications and updates, but I assume that did not affect anything with the microphone.
Unfortunately, I do not have any new suggestions, since I have done practically every "common fix," known on the subject and I have not been able to fix the issue.
I would really appreciate if anyone in the community can relate and provide an actual solution. My only last option is to switch back to a wired headset to see if that will resolve this problem; I will keep you updated.