The one-cord audio booster/adapter.
The VXi OmniCord-G #203366 is a one-piece solution that replaces both the audio booster and adapter cable, OmniCord simplifies headset setup for virtually all telephone systems. Just plug the standard RJ9 connector into your phone's headset port and connect the Quick Disconnect (QD) to your headset. Set the three-position compatibility switch and the microphone volume, and you're in business.
Note: This cord is designed to connect Jabra/GN headsets to telephone or VXi Amp.