Add electronic hook switch (EHS) functionality to compatible desk phone and wireless headset setups with the APP-51 EHS Cable. This cable enables remote call control so you can answer and end calls using headset controls (when supported by your specific phone and headset system), helping reduce the need for a mechanical handset lifter in compatible configurations. It is commonly used with Poly/Plantronics wireless headset solutions and supported desk phones, and you may receive call notifications in the headset where supported by the connected devices. Often used as a replacement for APS-50 in compatible setups, this accessory is designed for professional office and contact-center environments; compatibility varies by phone model and headset system, so verify your devices before purchase.