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 Polycom desk phones and may work with additional manufacturers.
Polycom IP320/321, IP330/331, IP430, IP450, IP550, IP560, IP650, IP670, VVX1500
Check with our Plantronics Product Configurator for more information.
Replacement Note: The APP-51 EHS cable replaces the APS-50 cable and
features compatibility with the Plantronics On-line Indicator accessory.
Support; http://www.plantronics.com/au/support/product/app-51