Silence and deafness

[temnix]

I'm interested in shouting vis-a-vis silence and deafness. I remember reading somewhere that silenced creatures are not supposed to be able to shout, but in my testing they can. Deafened creatures are not supposed to be able to hear shouts, and they do. Also how does the Shadows of Amn engine register that a creature is deaf? The guide here says that only EE keeps the spell state DEAFENED on the creature.