3.5mm Headset to Universal RJ9 Phone Switch Adapter

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This version of the RJ9 x series phone adapters allows you to use a 3.5mm headset with any office phone that has headset plug. The 8 channels cover most phone models including CISCO. Also includes a dedicated mute button and volume control slider.
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Product Overview

  • Use your 3.5mm headset with almost any office phone - 8 settings cover most phone models including Cisco
  • Combines the PH35-RJ9A of the PH35-RJ9Cisco adapters!
  • Works great with most VOIP phones with a RJ9/Rj10/Rj22 headset jack
  • Does not work with RJ11 jack, which is wider than your headset jack (6 positions vs. 4). RJ11 jack is what is in the wall. RJ9, RJ10, RJ22 are what is on your phone handset or headset.
  • Apple EarPods work on channels 1, 6 & 7

This amazing adapter switch converts the standard 3.5mm headset to a standard RJ9, RJ10, or RJ22 handset plug, allowing you to use your favorite headset with your IP phone. Once you plug the headset into our adapter switch, and the adapter into the designated headset jack of your phone, you will need to move the switch setting selector up or down until you get optimal sound for the phone you are using.

The adapter switch is approximately thirteen (13) inches long.


Q: What is the difference between this adapter switch, the 01-PH35-RJ9A and 01-PH35-RJ9Cisco adapters?

A: This PH35-RJ9X adapter switch is our newest Headset Buddy product. It acts as a combination of the PH35-RJ9A and PH35-RJ9Cisco adapters, allowing you to use your 3.5mm Headset with both Cisco and non-Cisco phones! You are able to do this by moving the switch setting selector to the setting that is perfect for the specific office phone you are using.

Q: How do I know what switch setting is right for my phone?

A: Due to the large number of phone manufacturers and phone models, we are unable to provide a conclusive switch setting list. To find the proper setting for your phone, you can do some basic testing. Simply plug the headset into the switch, and the switch into the designated headset jack in your phone. Then, move the switch selector up and down while listening to the quality of sound, until you find the setting that is right for you.

Q: My phone is not listed on your compatibility list. Will it work with your adapter switch?

A: Due to the large number of devices out there, we are not able to test our Headset Buddy products on every phone. If our Headset Buddy does not meet your expectations, please return it within 30 days of purchase so we can refund you in full.



All Headset Buddy products have a 1 year warranty! 

For further information about Headset Buddy's Warranty and Shipping & Returns policies select the imbedded links

Warranty Information

*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 handset jack. If your phone is on this list and the Headset Buddy doesn't work then we will refund 100% of your purchase plus pay for return shipping.

**For optimal use, please plug into the headset jack on your phone. The handset jack usually causes audio distortion

Incompatible Headset / Headphones

None yet!

Incompatible Phones

Avaya: 1100, 1200, 1600, 2000, 4600 and 9600 series

Cisco: 7902, 7905, 7910, 7911, 7912, 7920, 7921

Nortel 1140T and Visa 350

Most Polycom phones

Shoretel IP230

Uniden Dect2088, TRU9496

Western Electric 6250

Compatible Phones

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

Allworks 9212

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

Avaya 4500 Series IP

Cisco: 6921, 6941, 6961 - 7821, 7841, 7861 - 7931G, 7940, 7941G, 7942G, 7945G, 7960, 7961, 7961G, 7962G, 7965G, 7970, 7971, 7971G, 7975, 7975G, 7985, 7985G - 8811, 8841, 8851, 8861, 8865 - 8941, 8945, 8945G, 8961 - 9951, 9971 - 12VIP - 30VIP - CTS 500

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

GE Model 2-9451


Lucent 8410D

Mitel IP 40XX, 41XX, 5000, 50XX, 5140, 52XX, 53XX, 5550

NEC Dterm Series E

Norstar T7316E, M3904

Nortel IP 1120E IP, 1140E IP, 1150E IP, 1230, i2002 and i2004

Nortel Meridian Norstar Northern Telecom

Panasonic Hybrid

Plantronics T10

Possum Sero

Shoretel ShorePhone IP models


Splicecom PCS 520

Talkswitch IP Phone, TS-600


3COM 3102, 3103


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