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Badly heard interlocutor, XZ2 compact
Badly audible interlocutor, volume level to a maximum
Плохо слышно собеседника, XZ2 compact
Плохо слышно собеседника, уровень громкости на максимум
I've edited your post as this is an English only forum, you can use Google Translate to reply and/or post.
I'm sorry but I don't understand the issue.