Ok, I've thought about it a bit more.
What i have come up with is this:
Code:
|wall socket|----DSL filter----Splitter (DSL remains untouched)-----first socket on splitter(wire 30m long. jacks on this wire will be from telephone to RJ11 connection---router---pc
---second socket on splitter is telephone
i've asked my mum, and she said shes not worried about not having a telephone connection in the other room, so i guess im alright there. Only thing thats bugging me now is if the setup above will give any interference or not