I think this is what I came across http://community.eu.playstation.com/t5/Gaming-Network/PSN-Nat-type/m-p/24229415/highlight/true#M212606
I thought there was more about settings in it, but I'm sure that's the post I was remembering (the 3rd reply from mont)
Searching "technicolor" brings up quite a few threads and issues that you might like to have a look through.
Telia is in Sweden isn't it? Not a provider I'm that familiar with unfortunately (uk).