This may not be exactly what you're looking for. But it might help.
To know if the bulbs all work, press and release HOLD (when you are not on a call) and type in the word t-e-s-t (8378) and the #. All the lights will light, the screen will go blank showing if there are any bad spots in the...
How about just changing the extension numbers on the lab phones and not publishing them? Have all the old extension numbers (with X port) cover to the receptionist. And only the receptionis knows the new phone numbers. You don't even have to tell the people in the lab what the new numbers are.
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