The CEHS-AV 04 cable is designed to make calls convenient to manage – thanks to easy set-up, single-button operation as well as efficient and flexible answering/ending of calls. CEHS-AV 04 is compatible with the wireless IMPACT 5000, IMPACT DW, IMPACT SD and IMPACT D 10 headset Series together with the following EHS-compatible phones: Avaya 14xx Series, 94xx Series, 95xx Series, 96x1 IP Series and Grandstream GXP 16xx Series and GXP 21xx Series. Please check headset compatibility guide for more information.