Siemens hicom 150 H optiset E standard Operating Instructions Manual page 23

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You can show the number of external waiting calls on
the display by pressing the "View number of calls" key
(Æ page 50).
Press the "Waiting calls" key.
If the number of waiting calls exceeds a preset limit
while you are engaged in another call (overload), the
LED on the key lights up. Contact System Support to
find out the waiting call limit.
• LED off:
No callers waiting.
• LED flashes slowly:
You have reached the programmed threshold.
• LED flashes rapidly:
You have exceeded the threshold value (overload).
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