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|Seamlessly connect your Cisco Unified IP phone with all Plantronics Professional Wireless Headset Systems including the Plantronics CS Wireless product family (CS50 CS55 CS70 CS70N CS351N CS361N) and the Plantronics Voyager 510S Professional Bluetooth Headset System. This eliminates the need for a an HL10 lifter. The APC-4 enables the ability to answer and end calls from up to 300 feet away from your phone freedom to move about the office and multi-task connects with one simple step. The APC-4 is compatible with the following Cisco Unified IP Phones: 7975G 7965G 7962G 7945G and 7942G. The APC-4 Headset Hookswitch Control adapter will not work with Cisco IP phones 7940 7941 7960 7961 7970. Cisco firmware needs to be version 8.3(3)x or above. Unified Communications Manager version 4.1(3)SR5x or above. The Cisco APC-4 software functionality must first be enabled through the Cisco Unified Communications Manager administration application (default is "Disabled"). Contact your system administrator to enable this feature. The Cisco Unified IP Phone Expansion Module requires the use of cable adapter p/n 40287-05.|