Siemens OpenStage 60 T Operating Instructions Manual page 50

Basic functions
Step by Step
Edit call forwarding
50
Activating using the call forwarding key
Only fixed call forwarding can be activated via the
forwarding key.
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Press the key shown. The LED lights up.
Call forwarding is activated.
If you have not saved a call forwarding destination or
you would like to modify the existing number, a pop-up
menu appears.
Confirm the option shown.
You are then in the "Call forward status" menu and can
edit the required entries page 49.