Plantronics APC-4 EHS has been discontinued. If you have one of the older, discontinued Plantronics wireless headsets such as CS55, CS50, CS70N, CS351N, CS361N, you will unfortunately not be able to use the newer EHS cords. Your options would be to get the older model HL10 handset lifter with right angle plug (60961-34), or buy yourself a brand new wireless headset like the CS540
with the new EHS APC-43
Eliminate the need for the HL10 handset lifter with your Plantronics wireless headset! The Plantronics APC-4 Electronic Hookswitch EHS Cable (APC4 Hookswitch Control) works only
with the following Cisco Unified IP phone models listed above. Simply use this EHS instead of the HL10 for more seamless remote operation in conjunction with Plantronics wireless headset models CS50, CS55, CS70, CS70N, CS351N, CS361N and Voyager 510S.
The Cisco EHS adapter enables remote ring alert and call answer/end capability on your wireless headset from up to 300 feet away from your phone, allowing you to move freely throughout the office environment without missing a call (and without
the need for the external handset lifter HL10). One year factory warranty.