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 Tenovis desk phones and may work with additional manufacturers, check with our Product Configurator for more information. Replacement Note: The APT-31 EHS cable replaces the APT-30 cable and features compatibility with the Plantronics On-line Indicator accessory.