Why buy an expensive headset just for your IP phone? Use the Headset Buddy Adapter and your existing computer headset with VOIP phones that have a headset jack. A big productivity enhancer for home businesses, call centers, sales people, or anyone who is on the phone all the time, and wants to use a lower cost or more comfortable PC headset. Specs: This amazing adaptor converts the standard headset 3.5mm mic/audio plugs to a standard RJ9, RJ10, or RJ22 handset plug, allowing you to use your favorite computer/laptop headset with your IP phone. This adapter is designed for use with headsets that have two 3.5 mm. plugs; one for the microphone and one for the headphones/earpiece(s). The adapter outputs binaural sound for stereo headsets, meaning you will hear sound out of both ears. The adapter cable is approximately five inches long. All Headset Buddy products are EU RoHS Compliant. Aastra/Packet8/8x8 AltiGen IP Phone Avaya 4600 Series IP ESI 48-Key IP Feature Phone and 48-Key Digital Feature Phone GE Model 2-9451 Inter-Tel Mitel IP NEC Norstar Nortel IP 1120E IP, 1140E IP, 1150E IP, i2002 and i2004 Nortel IP - 1230 Nortel Meridian Norstar Northern Telecom: T7316, T7316E, M7310, M7208, M7308, M7316, M7324, M7900, M2216, M3903, M3904, M3905, M5208, M5209, M5216, M5317, M8001, M8003, SL100, model NTZK23AA, AB: (M2216):ACDI