With the missed call logging for shared lines feature, the administrator can configure Cisco Unified Communications Manager Administration, or the phone user can configure Cisco Unified CM User Options, so Cisco Unified Communications Manager logs missed calls in the call history to a specified shared line appearance on a phone.
This will only work if users who are sharing the number are logged in using Extension mobility.
You can configure it here under extension number by going into each phone:
If the box is checked, missed calls will be logged and if it is not checked then missed calls won’t be logged.