Siemens HIPATH 8000 OPTIPOINT410 - Manual (Page 211)

Web Interface
211
Select Function Key
A list of all possible functions that can be assigned to a key is shown on
page page 221
"Loudspeaker" function key
"Selected dialing" function key
"Phone lock" function key
The possibility of programming a key may be blocked by your service
personnel. In this case you get the message "Locked by administra-
tor" if you try to assign a function to this key.