Female RJ9 to 2.5mm Adapter Why buy another headset your new office phone? Use the Headset Buddy Adapter and your existing headset with office phones that have a 2.5mm headset jack. A big productivity enhancer for home businesses, call centers, sales people, or anyone who is on the phone all the time, but doesn't want to buy yet another headset. Specs: This amazing adaptor converts the standard headset RJ9/RJ10/RJ22 mic/audio plug to a standard 3 conductor 2.5mm plug. All Headset Buddy products are EU RoHS Compliant. Compatible Headsets: Headset Buddy Plantronics GN Netcom Jabra Compatible phones with 2.5mm headset jack: Altitouch AT&T Synj, 992, 1080, 1070, 1040, 993 Cisco SPA921, 501G, 502G, 504G, 508G, 509G, 525G, 7920, 7921 7921G, 7929, Powercube Linksys SPA 921, SPA 922, SPA 941, SPA 942, SPA 962 Nortel WLAN 2210 and WLAN 2211 Panasonic 7600, 7700 and 300 series Polycom SoundPoint IP 320, 321, 330, 331 Spectralink RCA Executive Series, Visys See The HeadsetBuddy website for an updated list.