AASTRA 4420 IP Basic (SIP) for MX-ONE User Guide - Manual (Page 31)

31 Dialog 4420 IP Basic
Call Forwarding
External Follow-me
If external Follow-me is allowed, you can have all calls to your
extension diverted to an external number of your choice. The
Follow-me lamp indicates that you have activated Follow-me.
During Follow-me, your phone can still be used for outgoing calls
and you will hear a special dial tone when you lift the handset.
Note: The Follow-me key is only used as a Follow-me
indicator. Nothing happens when the key is pressed.
Order *22# z
Dial and enter the digit or digits to get an external line.
z #
Enter the external number and press.
Press.
Cancel #22#
Dial.
Press.