Siemens Hicom 150 H Operating Instructions Manual page 13

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You can talk to internal parties with an optiset E system
telephone directly with a speaker call without any action
on their part.
Lift the handset.
Enter the code.
Enter the station number.
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You can transmit dual-tone multifrequency (DTMF)
signals to control devices such as an answering
machine or automatic information system.
You have set up a connection.
Enter the code.
You can use the keys "0" through "9", "
mit DTMF signals.
Ending the call also deactivates DTMF suffix-dial-
ing.
Your system may be configured so that you can
start DTMF suffix-dialing immediately after set-
ting up a connection.
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If this function is configured (contact System Support),
the system automatically sets up a connection to a pre-
set internal or external destination.
Lift the handset.
Depending on the setting, the connection is either set
up immediately or only after a preset period of time
(hotline after a timeout).
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