Great news!
Yeah, I've been using GN Netcom/Jabra headsets since the mid-1990s, starting with corded, and then one like yours, then the next model, and now the 9470 with EHS on a 1032. It really is the best way to use a business-class phone. My favorite thing is to wander around the house while on the phone, vs. sitting on my butt. I don't know about the older model you have, but the 9400 series has such long range, I can go outside, walk past my next-door neighbor's house, and still be on a conversation.
I'm glad we got it documented here, in one place. Thanks for the diagram.