Why do calls to this device get picked up by other devices?

1. Go to the phone’s Main Menu and select Settings.
2. Select Call Settings, select Call Divert
3. Check if the “forward” option is enabled, if this is the case disable. In this screen there are three further options “forward when busy”, “Forward when unanswered” and “Forward when unreachable”.
4. Enable/Disable the functionality you desire.