How to use training y-cables with USB QD cords for corded headsets. The most important thing to know is that: At this time, we do NOT offer a training solution for USB headsets that go straight into USB! They MUST be Quick Disconnect headsets in order to use one of our training cables!. Here’s what works best together: 2 Plantronics headsets + Plantronics Y-Cord (Cat #1232) + DA70 USB Cord (Cat #2368) Plantronics does NOT work with the Leitner Training Cord, use Plantronics cord only! 2 Leitner Headsets (PLUSH models included) + Leitner Training Cord (Cat #2431) + Leitner USB QD Cord (Cat #2346) Set compat on both the headsets AND the USB qd cord to 2 & 4 or 2 & 3 Leitner does NOT work with the Plantronics Training Cord. The mute feature mutes ALL sound from both headsets. 2 Sennheiser QD Headsets + Sennheiser Training Cord Cat # 1977 + Sennheiser USB QD Cord Cat # 2181 OR Cat # 2298 OR Cat # 2297 Sennheiser only works with Sennheiser Cords 2 EP Headsets + EP Training Cord (Cat #1191)…