1.1 Incoming Call Features18 Feature Guide1.1.3.2 Outside (CO) Line Ringing SelectionDescriptionAn extension user can select whether the telephone will ring or not when receiving call(s) from assigned orall outside (CO) lines through personal programming.Conditions• System programming determines which extension(s) will ring for incoming outside (CO) line calls ineach time service mode ( Flexible Ringing—Day/Night/Lunch [408-410]).• If an outside (CO) line call reaches a user's extension, but the extension is set to not ring, the CO buttonwill flash. The outside (CO) line call can be answered by pressing the flashing CO button.User Manual References3.1.2 Changing Personal Settings Using Programming Mode