Different b/n Nat traversal and NAT TCP Traversal?

[xipax]

can somebody explain the diifer pls.

[Lord Alderaan]

The common NAT Traversal employs UDP.

So I'm gonna guess the NAT TCP Traversal is its TCP counterpart although I haven't heard about it myself.

[Firon]

NAT traversal over TCP is nigh impossible.

[Switeck]

...or it gets called UPnP.