Siemens hicom 150 H optiset E standard Operating Instructions Manual page 90

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Pressed key does not respond:
Check whether the key is stuck.
Telephone does not ring:
Check whether the do not disturb function was activated on your tele-
phone (" Do not disturb" appears on the screen). If so, deactivate it
(Æ page 19).
You cannot dial an external number:
Check whether you telephone is locked ("US:Not authorized UK:Access
denied" appears on the screen). If so, unlock the telephone (Æ page 46).
To correct any other problem:
First contact System Support. If System Support is unable to correct the
problem, contact Customer Service.
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Always use a damp or antistatic cloth to clean the telephone. Never
use a dry cloth.
If the telephone is very dirty, clean it with a diluted neutral cleaner con-
taining surfactants, such as a dish detergent. Afterwards remove all
traces of the cleaner with a damp cloth (using water only).
Never use cleaners containing alcohol, cleaners that corrode plastic, or
abrasive powders.