Plantronics APU-7 EHS Cable - 83017-01 - headset adapter for Cisco Unified IP Phone 8961 9951 9971. Electronic Hookswitch communicates electronically with the phone eliminating the need for a HL10 lifter on many phones. APU-7 is designed for Plantronics Wireless CS product such as CS50 CS55 CS70 CS70N CS351N & CS361N. APU-70 is designed for Plantronics Wireless Savi product such as WO100 WO200 WO300 & WO350. This item cannot be shipped to APO/FPO addresses.