Which bottom cord do I need for a QD headset?

You need a bottom cord that matches both the headset brand and your phone. Jabra, Poly and EPOS each use their own QD plug, so a Jabra headset needs a Jabra bottom cord. The other end must suit your phone: a cord for the headset port on a desk phone, or USB for a PC. Our Headset Bottom Cords category lists each cord by brand and phone.