I think, maybe Wouters question has been misunderstood.
The correct translation of the answer is:
“There are 3 versions of multicast. The needed multicast function is only available in version 3 of IGMP. If you need this function to use t-home entertain, I’m sorry, I have to tell you, that this is not possible.”
I understand this, as if the router supports versions 1 and 2, but not 3.
Greetings from Austria 
Andy
