• Convert 2.5mm plug to single 4P4C RJ9/RJ10 headset plug for your VOIP phone
• Compatible with most IP phone headset jacks: Nortel, Avaya, Aastra, ESI, NEC, RCA, Mitel, Lucent, Shoretel, Siemens, and more...
• Save money by buying standard phone headsets to use with your phone's headset jack
• Reduce clutter with single headset
• Does not work with RJ11 jack, which is wider than your handset or headset jack (6 positions vs. 4). RJ11 jack is what is in the wall. RJ9, RJ10, RJ22 are what is on your phone's headset jack.

*Works best when plugged into headset jack. Connection to handset jack may cause audio distortion.

**Also works best when combined with an amplifier such as a Plantronics S-10 or M22.

* This list is not all inclusive. Please look up the specifications on your specific phone to see if it has a RJ9, RJ10, or RJ22 headset jack. Please let us know if you find more compatible phones or incompatible phone models.

Only compatible with 2.5mm headsets and some specific phones listed below. For Phones not listed below please see our PH25-RJ9 and PH25-RJ9Cisco

Incompatible Phones:

Avaya 2410, 1600 and 9600 series

Cisco phones (please see our PH25-RJ9Cisco & PH25-RJ9x)

Grandstream phones

Nortel 1140T and Visa 350

Polycom phones

Uniden Dect2088, TRU9496

Yealink phones

Incompatible Headsets

3.5mm headsets and headphones

Compatible Phones:

Aastra/Packet8/8x8 480e, 480i, 53i, 55i, 57i, 57iCT, 6753i, 6755i, 6757i, 9112i, 9133i, 9143i, 9480i

AltiGen IP Phone 500, 510, 600, 705, 710, 720

Avaya 4600 Series IP – 2420, 4610SW, 4612, 4620SW, 5610SW

ESI 48-Key IP Feature Phone and 48-Key Digital Feature Phone

GE Model 2-9451

Inter-Tel 8520, 8560, 8600, 8620, 8660, 8662, 8690

Lucent 8410D

Mitel IP 4015, 4025, 4125, 4150 5000, 5010, 5020, 5040, 5055, 5140, 5201, 5205, 5207, 5210, 5212, 5215, 5220, 5224, 5230, 5235, 5240, 5250, 5312, 5324, 5340, 5550

NEC Dterm Series E - DT330, DTP-8, DTP-8D, DTP-16, DTP-16D, DTP-32, DTP-32D, DTU-8, DTU-8D, DTU-16, DTU-16D, DTU-32, DTU-32D,DTH-8, DTH-8D, DTH-16, DTH-16D, DTH-32, DTH-32D

Norstar T7316E, M3904

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

Panasonic Hybrid

Plantronics T10

Possum Sero

Shoretel ShorePhone IP models: IP100, IP212K, IP230, IP530

Siemens Optipoint 420 Standard, Optiset E Advance, Optiset Advance Plus + Headset Adapter, Comfort 300E + Headset Adapter, Comfort F300E, Optipoint 410 Advance, Optipoint 410 Standard, Optipoint 500 Advance, Optipoint 500 Basic, Optipoint 500 Office, Optipoint 500 Standard, Optipoint 500 Standard SL, Optipoint 600, Optipoint 600 (requires headset port)

Talkswitch IP Phone, TS-600

Toshiba: Strata CIX, DP5022-SD, DP5023-SD, DP5018-S, DP5000-series, DKT 3001, 3010S, 3020S, 3020SD, 3014SDL (3000 series requires Toshiba BHEU adapter sold by Toshiba)

3COM 3102, 3103

Compatible Amplifiers

Plantronics S-12, M22, A20, MX10, TSB, AP15