The FBI release last Friday about vishing & Asterisk touched off a bit of a fury. It now appears that they have restated their warning acknowledging Digium’s original response to the matter in question (AST-2008-003) That being, all current v1.2 and 1.4 Asterisk systems will have been patched already. Asterisk v1.6 was never effected. Digium provides further clarification as well.
As always, keep your systems current!