Siemens OPTIPOINT HIPATH 2000 - Manual (Page 106)

Step by Step
Team and Executive/Secretary Functions With Trunk Keys
106
Deactivating call forwarding:
Press the key. The LED lights up.
> :
Select and confirm.
or
ride
Enter the code.
Press the trunk key you wish to use.
or
o
Enter the number of the trunk key you wish to use.
or
If available. Press the "Forward Line" key.
Meaning of LED Indications on the "Forward Line"
Keys:
The LED on the "Forward Line" key is off - call forwarding
is not active for this trunk.
or
LED on the "Forward Line" key is lit - call forwarding is
active for this trunk.
or
LED on the "Forward Line" key is flashing slowly - the
trunk is a call forwarding destination.
Program/Service
#501=Forward Line: Off?
If you have activated call forwarding for a trunk, a
special dial tone sounds when the line is seized.