Headset/Ear Phone for Nortel Networks Nt Nothern Telecom Meridian PBX Norstar M7208 M7310 M7324 T7208 T7316 M7900 and other business phones. Direct connect headset is the most cost-effective headset solution designed to increase your productivity. This headset will not require any additional adapter nor additional amplifier. They plug directly into the headset port at the back of your telephone. The headset complete with a 10-feet coiled cord with RJ9/RJ10/RJ12 headset or handset modular plug. You just simply plug this modular plug into the headset port on your phone and it’s ready to be used.