I managed to connect everything, but still have occasional problems.
Phone cables have 4 wires that are a bit thicker than wires in CAT5 cable for example.
This means they can not fit fine in keystone modules. That's why I had to remove the isolation, because only bare wires would fit in connectors. It seems that these bare wires now occasionaly make contact with each other, which causes crackling noise and break of ADSL TV signal.
Any ideas how to terminate these phone cables to avoid problems?