Compatible with below phone models(including but not limited),
Avaya:1220,1230,1408,1416,1603,2400,2410,2420,4610,4620,4621,4622,4624,4625,4626,4630,5410,5420,5601,5602,5610,5620,5621,5625,6210,6408,6408+,6408D,6211,6218,6219,6220,6221,6402,6402D,6410D,M,6414\
Polycom: SoundPoint 300 301 335 430 450 500 (rev. E or later) 501 550 600 601 650 670 CX300 CX500 CX600 CX700 VVX300 VVX310 VVX400 VVX410 VVX500 VVX600 VVX1500 with a dedicated headset jack
Nortel: M3903, M3904, M3905, M5208, M5209, M5216, M5317, M8001, M8003, T7316, T7316E, M7310, M7208, M7308, M7316, M7324, M7900, M2216, SL100 NTZK23AA
Alcatel:4004,4010,4018,4019,4020,4022,4035,4037
Yealink: SIP-T19P,SIP-T20P,SIP-T21P, SIP-T22P,SIP-T23P, SIP-T23G, SIP-T26P,SIP-T27P, SIP-T28P, SIP-T29G, SIP-T32G, SIP-T38G,SIP-T41P,SIP-T42G,SIP-T46G,SIP-T48G,SIP-T21PE2,SIP-19PE2
Snom: 320,360,370,820,870
Grandstream: GXP1200,GXP1400,GXP1405,GXP1610,GXP1625,GXP2020,XP2100,GXP2110,GXP2120,GXP2124,GXP2130,GXP2140, GXP2160
Please feel free to reach us for headset compatibility advice.