Sorry, but I do not agree with the above 2 replies around the behavior when clicking the X in the top right hand corner of the app to minimise to the system tray rather than closing the app. This is an in app behavior setting and not Windows. We currently use Bria and when the X is clicked by the User it minimises to the system tray, if this was not the behaviour then the User would actually close the app and not receive any incoming calls and not be aware of it.
Thank you for the replies around the auto startup and I have worked out this issue.