Whenever the North American Numbering Planning Administration releases a new toll-free prefix (e.g. 1-800, 1-888, 1-877, 1-866) there is always a lengthy delay for individuals operating some telephone switches to update their routing tables. Its common to be in hotels, and find the hotel PBX doesn't recognize a recent toll-free prefix. So to "fix" this problem, why don't we move all 9-1-1 numbers to the new toll-free prefix, which will break stuff for people who don't update their PBX's promptly. When they find out they can't report a fire in the hotel because their PBX is blocking the new prefix, then they'll fix the PBX. Let's get real, no one is going to break any "critical" resource just for the purpose of making people fix their systems. Rob's bogon lists are good, but unless you have the processes in place to keep it update to date (or hire an consulting firm to do it for you), its about as useful as putting a list of "invalid" phone numbers in your PBX. The lists change all the time, and unless you are a full-time LERG expert, it will probably get quickly out of date. Of course, we can always use LDAP to keep all the PBX's updated.