Sony ICD-BM1AVTP Operating Instructions Manual page 37

Messages with priority mark(s)
Messages are sorted in order of the number of priority mark(s) (v) in a
folder. Messages without a priority mark are moved behind the messages
with priority mark(s).
1 Tip
If there are over 2 messages with the same number of priority marks in a folder,
these messages are sorted by the recorded date and time (The oldest one comes
first).
e.g. When there are 3 messages in a folder
Message 1 Message 2 Message 3
Note
You can also add priority mark(s) using the supplied Digital Voice Editor
software. But messages are not sorted in order of the number of the priority
marks unless you sorted by the number of priority marks using the software.
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