[quote=@SgtEasy]
<Snipped quote by Willy Vereb>

Yeah, it's psychic based. Interested of what you'll cook up :)
[/quote]Nothing special.
Just a simple defense mechanism which filters out subliminals, hypnotics and psychic brainwaves from incoming message.
Let's say the Morteans had a nasty first contact experience with one of the xenos in their sector.
Same about hyperspace jump ambushes. The warp jammers around the borders were set up for a very good reason.