Today I needed to visit my Mitel site to look at TAFAS (217-14) it works, but.... the new owners cleaned up the boiler room and behind the mystery cabinet, look at this!
They are probably going to be oriented wrong, but tilt your head to the left and you'll see it's a mystery crossbar system.
I didn't get who made it, I didn't see a power supply, but outside of that, it appears to be intact.
Carl
edited to make pictures viewable