I was near Balota on one side of the wall that is high enough so you cant jump over it. By mistake i ran straight for it and jumped when i was around 1 meter from it, and i went through it to the other side without harm :)
Tried a few times more without making it again. But im sure its possible :)
Stand around 10 meters from the big wall (around 10 meters left of the holes at the bottom at one place) and run for it, and jump when you are around 1 meter from it. Thats it. I was on the north side, going south.
Server was some .se server 24 hours ago. Ping was around 20 and it was 15-20 players on the server.