4Call KQCM10 Polaris QD to RJ Quick Disconnect Cable U10 Coiled for Plantronics Headset to M10 M22 Vista Adapter and AT&T CallMaster V VI & Cisco Unified Office Telephone IP Phones 7931G 7975 WORKS ONLY FOR PHONES LISTED IN DESCRIPTION, BUY ONLY WHEN YOU HAVE ONE OF THE PHONES LISTED. CONTACT US FOR GUIDE IF YOU ARE NOT SURE ABOUT YOUR PHONE COMPATIBILITY. NOT COMPATIBLE WITH CISCO SPA PHONE SERIES! Works with Plantronics H/HW series. VXI P series, Smith Corona P Series, Starkey PL Series, The One Headsets. Quick Disconnect allows you to disconnect from your headset without losing your call. This cable works with the following Plantronics headsets: Starset H31 H31N Mirage H41 H41N Supra H51 H51N H61 H61N TriStar H81 H81N Encore H91 H91N H101 H101N FreeHand H131N DuoSet H141 H141N DuoPro H151 H151N H161 H161N H171 H171N H181 H181N and SupraPlus H251 H251N H261 H261N etc. No Headset included in Package