Poly/Plantronics APC-43 EHS for Cisco Desk Phone #38350-13
Electronic Hook Switch Cable for remote desk phone call control (answer/end) for CS500 and Savi series wireless. This cable eliminates the need for a HL10 Handset Lifter. This cable works with a Cisco of desk phones and may work with additional manufacturers.
For more information download the EHS Guide here
For complete compatibility info click here