Plantronics Savi APC-42 Electronic Hookswitch (EHS) cable for Cisco IP Phones - communicates electronically with the phone, eliminating the need for the HL10 lifter. Only compatible with these Plantronics Savi 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 the firmware version, press the Settings button on the phone (the checkbox icon). Select “Model information”. The firmware revision is listed under “Load File.” Open the desired phone. Scroll down to "Wireless Headset Hookswitch Control" Set to "Enabled" Click "Apply". Wait for the dialog box to ap.
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