This RJ9 telephone headset is compatible with mainstream brand IP phones, such as AVAYA, Polycom, Fanvil, NEC, Nortel etc. MKJ9600P noise cancelling phone headset for office phones is equipped with a noise-cancelling microphone which reduces up 85% background noise. This corded phone headset is suitable for contact centers, telemarketing offices, home-based phone jobs. It features with: Crystal clear soundWideband audio technologyAll-day wearing comfortHearing protectionQuick disconnect Headset Compatibility (Included but not limited) Part of Phones Compatibility (Included but not Limited) AVAYA: 1408, 1416, 2410, 2420, 4610, 4620, 4621, 4622, 4625, 4630, 5410, 5420, 5610, 5620, 5621, 5625, 9404, 9406, 9408, 9504, 9508 Aastra: 390, 470, 480e, 480i, 53i, 55i, 57i, 57iCT, 6725i,6753i, 6755i, 6757i, 8004, 8009, 8314, 8324, 9009, 9216, 9112i, 9133i, 9143i, 9316cw, 9417cw, 9480i AudioCodes: 405HD, 420HD, 430HD, 440HD, 445HD, 450HD Polycom SoundPoint: 300, 301, 335, 430, 450, 500 (rev. E or later), 501, 550, 600, 601, 650, 670 Toshiba: DP5022-SD, DP5023-SD, DP5018-S, DP5000, DKT 3001, 3010S, 3020S, 3020SD, 3014SDL Fanvil: C68, C66, C62, C58P, C58, X3/X3G, X5/X5G, C01 Gigaset: DE310, DE410, DE700IP, DE900IP AltiGen: AT-500, AT-510, IP-600, IP-705, IP-710, IP-720, IP-805 Ericsson-LG: 8501,8515,8540,8815,8820,8830,8840,LIP8012D,8024D,8040L