Sennheiser Electronic Hookswitch for Cisco 7900 Series Phones (CAT #1785): - Connect green and pink cord into PHONE and ACC port of cube - Connect the other end in both the Headset and Aux ports of Cisco - Compat on A & Move dipswitch #1 down Sennheiser Electronic Hookswitch for Cisco 8900 & 9900 Series Phones CAT #2121): - Connect green cord into PHONE port in cube - Connect the other end in the USB port in Cisco - Compat on A & Move dipswitch #1 down Sennheiser Electronic Hookswitch for Cisco SPA Series Phones (CAT #2216): - Connect green and pink cord into PHONE and ACC port of cube - Connects into Headset port (2.5mm) of Cisco - Compat on A & Move dipswitch #1 down Sennheiser Electronic Hookswitch for Cisco 8941 and 8945 Phones CAT #2408) - Connect green and pink cord into PHONE and ACC port of cube - Connects to the headsets jack of Cisco - Compat on A & Move dipswitch #1 down These settings may only work for the 7900 series EHS (CAT #1785) A. On the phone, you can verify that th…