AASTRA 4223 Professional for BusinessPhone User Guide - Manual (Page 55)

55 BusinessPhone — Dialog 4223 Professional / Dialog 3213
Call Forwarding
Re-activate External Diversion
Divert your calls to an external position. *22*#
Dial to activate the programmed External Diversion.
You can make outgoing calls as usual. A special dial tone reminds
you that Call Forwarding is active. The display shows that you have
activated an External Diversion.
í
Press.