TO SET UP EHS: Enable phone headset settings through DIGIUM'S web portal PREFRENCES TAB> CALL ANSWERING> HEADSET ANSWER: SELECT YES. If needed Click “Submit” or “Save Phone Settings” when finished DISCONNECT DCA FROM HEADSET SYSTEM, ACCESS PHONE MENU OPTION:PREFERENCES > CALL ANSWERING> HEADSET ANSWERING. SET HDS ANSWERING TO YES, AND EHS TO AUTOMATIC. If needed, Click “Submit” or “Save Phone Settings” RESTART PHONE Click the Restart (option 6 of the Main Menu) to restart the phone. The phone will ask you to confirm the restart. NOTE: You can also restart your phone by holding down the 7, 5, and 3 keys. AFTER THE RESTART HAS COMPLETED, CONNECT EHS, RECONNECT DCA TO HDS SYSTEM NOTE: SENNHEISER NOT EHS COMPATIBLE WITH DIGIUM TELEPHONES. For EHS phone must have Firmware 1_1_3_0_52406 and Earlier OR 1_3_0_0_53680 and Later User must contacts phone / i.t. department.If EHS not function with correct firmware and menu settings.