AASTRA 4223 Professional for BusinessPhone User Guide - Manual (Page 74)

Messages
BusinessPhone — Dialog 4223 Professional / Dialog 3213 74
Returned messages
Messages that have been left unanswered for a long period are
sent back to you. To check returned messages:
Message
Ц Ф
Press.
sent-back
Press (see display).
Use the menu keys to check returned messages (see
display).
You can erase or re-send the message.
í
Press to finish the procedure.
12 May 10:35 +15°
SELECT FUNCTION
send receive administr sent-back