The RJ9 phone headset is compatible with following phones(Including but not limited)
3COM: 3102,3103
Aastra:390,470,480e, 480i, 53i, 55i, 57i, 57iCT,6725i,6753i, 6755i,6757i,8004,8009,8314,8324,9009,9216 9112i,9133i, 9143i,9316 cw,9417cw, 9480i
Alcatel:4004,4010,4018,4019,4020,4022,4035,4037
AltiGen:500,510,600,705,710
ATCOM:R4,R3,R2,R1,AT840,AT820,AT810,AT800
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,6414,6416,6416D+M,6424,6424D+,8101,8102,8110,8400,8403,8405,8406,8410,8434D,X,8503,8510,8520,8528T,9404,9406,9408,9410,9504,9508
Digium:D40, D50, D70
Ericsson-LG: 8501,8515,8540,8815,8820,8830,8840,LIP8012D,8024D,8040L
Fanvil:C68 ,C66,C62, C58P, C58,X3/X3G,X5/X5G,C01
Gigaset DE310, DE410, DE700IP, DE900IP,3000 comfort, 3020,3025,3035
Htek:UC802P,UC803P,UC804P,UC806P,UC840P,UC842,UC860P,UC862,UC902,UC903,UC913,UC923,UC924,UC926
Mitel:4001,4015,4025,4125,4120,4150,401,410,420,430,700,7000,5000,5010,5020,5040,5055,5140,5201,5205,5207,5210,5212,5215,5220,5224,5230,5235,5240,5250,5312,5324,5330,5340,5550
Nortel:M3903,M3904,M3905,M5208,M5209,M5216,M5317,M8001,M8003,T7316,T7316E,M7310,M7208,M7308,M7316,M7324,M7900,M2216,SL100 NTZK23AA,AB:(M2216):ACDI,1120EIP
Polycom:CX100,CX200,CX300,CX500,CX600,CX700300,301,335,400,430,450,500(revater),501,550,560,600,601,650,670
Siemens: Optiset,F300E,Optipoint 410, 420, 500
Toshiba: DP5022-SD,DP5023-SD, DP5018-S, DP5000-S,DKT 3001, 3010S, 3020S, 3020SD, 3014SDL