Manager privilege to eliminate NewExt event? call,all?

I see in:
that have privilege for NewExt event:
dialplan - Receive NewExten and VarSet events. Read-only.

But the NewExten has:
Event: Newexten
Privilege: call,all
Timestamp: 1130591755.848597

So is come to client even I not add to my manager.conf dialplan privilege?

+So I not see a way to eliminate NewExt event(80% of traffic)?
+More question, what mean “Privilege: call,all”? this is all or call?