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
activated, internal callers hear a busy signal and external
callers are rerouted to a telephone assigned for this
purpose (System Support).
Lift the handset.
Enter the code for "on" or "off".
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You can have the carrier identify malicious external
callers. 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.
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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).
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.
After you have finished tracing the call, the data
is stored on the carrier's system. Now contact
System Support.