Function Selection - Telephone Switching Functions - Siemens 300 Operating Instructions Manual

General
You can use the display key to scroll to the next function, for example, if a
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call is in progress. When the required function is displayed, simply press the
display key, e.g. , and follow the user guidance. The other user is
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unaware that your are "scrolling". The functions offered by display keys are
only activated or executed when the key has been pressed.
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