If it's an 016ETR, you can convert the last six ports to t/r. 016 TR you don't convert a thing. Stick a regular single line household phone in that thing and see what you get.
If people are doing this by using an SA button and pressing 799, you could try to renumber 799 to something different. Go into system renumber and choose group page. It will ask you for the old group page (799). Then just choose something only you know. You might want to do a system dial...
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