"Standart rington" "Standart bildirishnoma tovushi" "Standart signal tovushi" "Rington qo‘shish" "Signal kiritish" "Bildirishnoma kiritish" "O‘chirish" "Maxsus rington qo‘shib bo‘lmadi" "Maxsus ringtonni o‘chirib bo‘lmadi" "Tovushlar"