When I browse to the Invitation URL, it resolves to http://home.meetingmux.com. Why isn't this branded?

The URL for meeting Invitations is used when you click the "Invite" button in the MeetingManager application. In that case, the URL will be appended with the user's details, and will launch the correct page. You should not provide this URL to clients as a standalone destination. It is not meant to be used without the user's parameters, and if it is, will be redirected to a 'generic' meeting landing page.