See also:

Channel preset
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Taking a phone call and declining an incoming call
To take a phone call: Press the OFF hook switch . To put an incoming call on hold: Press the ON hook switch briefly. To decline an incoming call: Press the ON hook switch for more than 1.5 ...

Safety symbol
You will find a circle with a slash through it in this manual. This symbol means “Do not”, “Do not do this”, or “Do not let this happen”, depending upon the context. ...