I'm trying setting up a UT3 gameserver through a 2820Vn.

The Gameserver requires access to a external stun, however it reports NAT as being strict.

I've read that the router may not be full cone nat or that the router maybe blocking stun from client machines to the outside due to the router using stun for its voip functions (which i don't use).

Can anyone confirm/suggest a solution (ie enabling full cone/disabling voip)?

I have opened all the necessary ports for the gameserver by the way. (7777,6500,13000)

Thanks, Dan