This link was posted in the tito thread because of the first part, but if you wait till :27, Chael Sonnen comes on and accuses Silva of greasing with baby oil and being a (and I quote) "cheater". LOL wut.
edit: relistening to this it definitely sounds EXACTLY like him. The nasal whine, the sighs during speaking, the little cackling laugh, all of these elements are present in both segments of that audio. either someone does a PERFECT impression of him, or he's full of shit.