Don’t repeatedly push the buttons really fast or run your fingers up and down the control panel keys.
Always use a high-quality surge protector/suppressor.
Remember that if you have a key latched, then someone on the system can hear what you are saying.
Even if you don’t have a key latched to a particular destination, someone may still be able to hear you via a partyline.
If you don’t have any keys latched, someone might have a listen key to you and hear your conversations. (In short, if the mic is plugged in and the mic on switch is lit, you can still be heard by others so be careful what you say!)
If using a headset, remember to remove it before moving away from a panel.
Kill your talk key before taking off and set down your headset otherwise, an unpleasant sound will be produced.
Try not to point the microphone towards the loudspeaker.
Make sure you know what you are doing before you adjust local panel settings.