Siemens Hicom 150 H Operating Instructions Manual page 10

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You can activate the do not disturb function if you do not
want the receive any calls. When do not disturb is acti-
vated, internal callers hear a busy signal and external
callers are rerouted to a telephone assigned for this pur-
pose (System Support).
Lift the handset.
Enter the code for "on" or "off".
When you lift the handset, a special dial tone
(continuous buzzing) reminds you that "do not
disturb" is active.
Authorized internal callers can automatically
override the do not disturb function after five sec-
onds.
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You can have the carrier identify malicious external call-
ers. You can save the caller's station number during the
call or for 30 seconds after the call ends. However, it is
essential that you do not replace your handset during
this time.
You are engaged in an external call.
Enter the code.
After you have finished tracing the call, the data
is stored on the carrier's system. Now contact
System Support.
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If an entrance telephone has been programmed, you
can use your telephone to speak to someone at the en-
trance telephone and to activate a door opener.
If you are authorized to activate a door opener (contact
System Support), visitors can open the door them-
selves by entering a 5-digit code (using a DTMF trans-
mitter or installed keypad).