The Plantronics APC-41 EHS Cable has been discontinued and replaced with the Plantronics APC-43 EHS Cable.
Plantronics APC-42 SAVI Electronic Hook Switch cable for Cisco replaces the APC-40 and APC-41 Cable and includes compatibility with the Plantronics On-Line Indicator (sold separately).
Plantronics APC-42 Electronic Hook Switch (EHS) Works with the following Cisco phones:
7942G, 7945G, 7962G, 7965G, 7975G
7821, 7841, 7861
8811, 8841, 8851
Use with the CS500, SAVI and Voyager Legend headsets.
For more Plantronics APC-42 EHS Cable for Cisco infomation: