AASTRA 4147 Medium for MX-ONE (TSE) User Guide EN - Manual (Page 54)

Messages
Dialog 4106 Basic/Dialog 4147 Medium 54
Voice Mail (optional)
You may be connected to a Voice Mail application, contact your
system administrator for more information and see separate
instructions for the application.
The Voice Mail application allows you to leave a voice message to
the caller when you are unable to answer calls, e.g. when out of
office, in a meeting, etc. The caller can then leave a message in
your mailbox. When back in your office, you can enter your mailbox
and listen to the messages received.
If you use the Personal Number feature, it is recommended to
program Voice Mail as the last answering position for all search
profiles.