All 0900 numbers are blocked, but I do not think normal national toll calls can be blocked. Reason why I think so is because if I dial a number just outside my toll free area then I do not have to include the area code even though it is not in my toll free area. But I'm sure someone will correct me if I'm wrong.
I'm not worried about 0900, I just want to be able bar toll calls. The VFX system can identify them (via billing) so I can't see why there isn't somewhere to control access to those numbers. I will email the help desk if I don't find out for sure from here.