I think I may have something similar. I have a Merlin Legend; the MLX phones are used throughout the house. In the Library, I have my working 1A2 collection of phones. I use the T&R jacks from the Merlin Legend cards to feed 400 type KTUs. One Legend T&R line goes to each KTU, which simulates the CO lines. I use the WE intercom cards in one of the 1A2 modular panels to assign a station to each of the 1A2 sets. So with this arrangement, each 1A2 sets rings when you dial the Merlin Legend intercom number, and the 6th button on a 1A2 sets is the WE intercom. It's functional, and fun!