PH25-RJ9Cisco - 2.5mm Headset to RJ9/RJ10 CISCO Phone Adapter

(1 review) Write a Review
This adapter converts a headset with a 2.5mm TRS plug to a 4P4C Cisco headset plug. The VoIP RJ9 plug allows 2.5mm headsets to work seamlessly on your CISCO phone.
Bulk Pricing:
Buy in bulk and save

Out of Stock!

Product Overview

Why buy an expensive headset just for your Cisco IP phone? Use the Headset Buddy Adapter and your existing 2.5mm phone headset with Cisco VOIP phones that have a headset jack. Save money by using a 2.5mm headset with your Cisco office phone.

  • Convert 2.5mm plug to CISCO phone single 4P4C RJ9/RJ10 headset plug
  • Save money by buying standard phone headsets to use with your Cisco phone 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 handset or headset. 

The PH25-RJ9Cisco converts the standard phone headset 2.5mm plug to a standard RJ9, RJ10, or RJ22 Cisco phone headset plug, allowing you to use your favorite phone headset with your Cisco office phone. The adapter outputs binaural sound for stereo headsets, meaning you will hear sound out of both ears. 


The adapter cable is approximately five inches long.


Free returns, always!

We have a 30-day, no-questions-asked return policy for all of our products as well as a one-year, 100% Satisfaction guarantee; We’ll replace your Headset Buddy for free within the first 12 months.

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

Warranty Information

Only compatible with Cisco and Ativa phones. Will not work with Polycom, Aastra, Nortel, and most other phones.

Will not work with Cisco handset plug or RJ11 (wall) jacks.

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. If the Headset Buddy doesn't work with a model on this list we will be happy to refund 100% of your purchase plus pay for return shipping

Incompatible Cisco phones:

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

Compatible Cisco Phones

6921, 6941, 6961

7931G, 7940, 7941G, 7942G, 7945G, 7960, 7961, 7961G, 7962G, 7965G, 7970, 7971, 7971G, 7975, 7975G, 7985, 7985G

8941, 8945, 8945G, 8961, 8961

9951, 9971



CTS 500

Please let us know if you find more compatible phones or incompatible phone models.

Product Videos


(1 review) Write a Review

1 Review Hide Reviews Show Reviews

  • 5
    Shockingly perfect

    Posted by Unknown on 7th Jun 2016

    This little jack did the trick and saved us money, as opposed to buying the other expensive alternatives.

Headset Adapter Finder