Multicast routing / forwarding

Hi,

I've got a question about routing / forwarding multicast.
I'm trying to do this with Rras but with no luck.
I have multiple multicast groups on 1 site of the network and with a
windows server I would like to forward this to the other side of the
network.

I was able to join the multicasts with Rras but the forwarding function
wasn't working.
I have been searching on Google / Microsoft but couldn't find the
answer.

Because I've got multiple sources I would like to have an option to
individually route / forward the streams.

Could somebody send me in the right direction?
Any information about this subject would be great

Greets,

Passie