> That would depend on where the number went "back" to.
>
> Underlying carrier? Pooling? Another level of ITSP resale?
>
> Number block ownership and routing is assigned. Carriers can't just
> pick a number and start providing it. Kind of like IP addresses and BGP.
>
I don't know if I would make the comparison to IP and BGP...
It's widely known (and demonstrated) that very, very few (if any)
upstreams filter and/or verify route advertisements. It's really a
mess.
Spammers advertised "unused" blocks they find and spam from them.
Pakistani Telecom jacks YouTube somewhat-globally with a more
specific advertisement of YouTube's IP space.
Pilosov/Kapela attack, etc.
Totally off topic but I though I'd at least bring it up.
--
Kristian Kielhofner
http://blog.krisk.org
http://www.submityoursip.com
http://www.astlinux.org
http://www.star2star.com
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