The unread vmails are in /var/spool/asterisk/voicemail/default/(ext)/INBOX when the are read they are moved to /var/spool/asterisk/voicemail/default/(ext)/Old you would have to rename them appropriately and move them from INBOX to Old to have them “marked” as read.
A quick reference to all AMI command can be browed from the Asterisk CLI with :-
Not to worry - we’d rather you ran it through Google Translate than post in Italian.
A lot of folks here have been working with forums for a long time, so we understand a lot of what gets posted through GT. The part that made me laugh was “I move with copy anointing”. It isn’t every day you see the word “anointing” (which is English for “Benedetta da Dio”) in a technical post.