AASTRA DT4x2 for BusinessPhone User Guide EN - Manual (Page 62)

Messages
BusinessPhone – Cordless DT412/DT422/DT432 62
Forward a Voice message
Your received Voice messages (in the Individual Mailbox) can be
forwarded to other Mailbox numbers (Individual or Common). When
you Forward a Voice message to an Individual Mailbox, the Mailbox
number is the same as the extension number. *59#
Dial.
Note: Depending on the configuration, you might be asked
for your Password before you can retrieve your messages.
See section “ Security ” on page 68.
Follow the voice announcements.
You can forward new, heard or stored voice messages.
Note: The forwarded message is a copy, i.e. it can be
deleted without deleting the original message.
Repeat the procedure to forward the message to another
mailbox.
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Press to finish the procedure.