Electronic Hook Switch Cable for remote desk phone call control (answer/end). This cable eliminates the need for a HL10 Handset Lifter. This cable works with Cisco and Avaya/Nortel desk phones and may work with additional manufacturers, check our Compatibility Guide for more information. Replacement Note: The APU-72 EHS cable replaces the APU-71 cable and features compatibility with the Plantronics On-line Indicator accessory.