Really? weird... they don't for me. Yeah if you can nab some of the older ones I want to try them with my dataslicer and see what works with Type I and IIi systems. I don't recall if 381 does... so I'm thinking we may have to dip into the 3.70's. I know some of the 3.8xEC (Eric Cottrell) versions work for a bit, then stop working. Eric did some great work bringing DOS Trunker up to speed the past few years, but somewhere along the way Type I trunking got broken. Unfortunately neither Trunk88 or UniTrunker work properly on these systems either so it's time to break out the old DOS box.