Electronic Hook Switch Cable for remote desk phone call control (answer/end). This cable eliminates the need for a HL10 Handset Lifter. (Cisco)
The APC-41 has been discontinued and replaced with the APC-42
This cable works with Cisco desk phones and may work with additional manufacturers.
Replacement Note: The APC-41 EHS cable replaces the APC-40 cable and features compatibility with the Plantronics On-line Indicator accessory.