From The Guest's Telephone - Siemens HiPath 3000 User Manual

Checking and changing features

From the guest's telephone

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Lift the handset.
Enter the access code for HiPath Hotel Entry
(if your communication platform does not have "au-
tomatic DTMF dialling", you will have to add "∗ 5 3"
with optiset E entry; consult your service techni-
cian!).
9 1
Enter code for "Clean room".
Replace handset.
The access code for HiPath Hotel Entry is
available from the hotel directory (or con-
sult your service technician).
Ignore wakeup call announcement.