Siemens hicom 150 H optiset E standard Operating Instructions Manual page 26

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Program/Service
* 53=DTMF dialing?
Reserve trunk?
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You can transmit dual-tone multifrequency (DTMF) sig-
nals to control devices such as an answering machine
or automatic information system.
Press the key. The LED lights up.
Select and confirm.
or
Enter the code.
You can use the keys "0" through "9", "
mit DTMF signals.
Ending the call also deactivates DTMF suffix
dialing.
Your system may be configured so that you can
start DTMF suffix-dialing immediately after
setting 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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If this feature is configured (contact System Support),
you can reserve a busy trunk for your own use.
When the trunk is free, you receive a call and a message
appears on the display.
Precondition: The message "US:Currently busy
UK:busy at the moment" appears on your screen.
Confirm.
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