The CEHS-CI 03 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-CI 03 is compatible with the wireless IMPACT 5000, IMPACT DW, IMPACT SD and IMPACT D 10 headset Series in combination with the EHS-compatible Cisco desk phones SPA512G*, SPA514G* and SPA525G2*. Please check headset compatibility guide for more information. (*Cisco System software version 7.5.4 or higher is required)