Siemens 500 advance User Manual

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Making and Answering Calls
25
Step by Step
Display Number of Waiting Calls and 
Overload Indication
You can show the number of external waiting calls on 
the display by pressing the "View number of calls" key 
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 your service person-
nel 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).