Hi, I got Entertain (IPTV from Deutsche Telekom) to work with my Turris Omnia. I documented the necessary configuration in my blog: https://blog.ohrensessel.net/2017/02/16/entertaintv-with-turris-omnia/
I don’t know if this works with the normal Telekom media receiver connected to your normal LAN, but you could give it a try. I can watch TV via VLC from my computer (which is in my LAN).