When you activate dnssec for a domain in ispconfig you still need to get the keys to your registrar. I've created a plugin to do that for the registrar https://openprovider.eu The code is available on a branch in my git fork ... https://git.ispconfig.org/helmo/isp...plugins-available/openprovider_plugin.inc.php
Would be great to get such a plugin for Realtime Register as well... if no one picks it up I surely will