Siemens hicom 150 H optiset E standard Operating Instructions Manual page 19

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DND on?
DND off?
Ringer cutoff on?
Ringer cutoff off?
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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).
Select and confirm.
or
or
or Enter the code for "on" or "off".
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You can activate the ringer cutoff function if you do not
want the receive any calls. Calls are only identified by
one ring signal, an indication on the display, and a key
which has been programmed to flash (such as a trunk
key).
Select and confirm.
or
or
or Enter the code for "on" or "off".
When you lift the handset, a special dial tone
(continuous buzzing tone) 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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