APC-42 is compatible with the following Cisco phones: 7821, 7841, 7861, 7942G, 7945G, 7962G, 7965G, 7975G, 8961, 9951, 9971. Enables remote answer / end for Savi Office; Savi 700 Series & CS500 Series Wireless Headsets. This is the Plantronics CS500 and Savi series APC-42 (replaces APC-41) Electronic Hookswitch (EHS) cable for Cisco IP Phones - communicates electronically with the phone, eliminating the need for old mechanical HL10. the APC-42 is only compatible with these Plantronics wireless headset models: The Cisco server must be running Cisco CallManager System Version 4.1(3)SR5x or higher. Verify by logging onto the Callmanager with a browser. Press the detail button on the main page to display the SW version. The Cisco phone must be running firmware 8.3(3)x or higher. To locate.
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