AASTRA 4225 for MX-ONE Telephony Switch - Manual (Page 62)

Call Forwarding
Dialog 4223 Professional/Dialog 4225 Vision 62
Call Forwarding
Diversion
If you do not want to be disturbed or will be out of the office, you can
have all calls to your extension diverted to a preprogrammed answering
position. During Diversion you will hear a special dial tone and the
Diversion lamp indicates that your Triple Access Line is diverted. You
can still make calls as usual.
Diversion can be made direct, on no answer, on busy or to another
information service facility.
Note: If your phone is programmed with “Multiple Directory
Diversion and Do Not Disturb” (ask your system
administrator), Diversion is ordered and cancelled
simultaneously on all lines.