I know that traffic downloaded / uploaded from xnet servers is not counted towards your bandwidth, but is traffic from one xnet customer to another also counted as local (not charged)?
I don't know if it costs xnet more for national traffic than traffic between xnet users, but if it does then surely they would want to encourage xnet to xnet traffic?
Xnet user to Xnet user is national traffic because it leaves our network and goes through Telecom and back in the network to get to the other person. Even if users are on the same terminating circuit at Xnet their traffic doesn't stay local to the network. That's how the DSL network works.