On Fri, May 09, 2008 at 08:13:08PM -0400, John Scully wrote: > OK - A few people here have touched on the right answer, but I am going to > say it more bluntly: > > No limit on ability to "spoof" outbound callerid/ANI is possible without > crippling the ability to aggregate traffic from customers. An aggregator > has zero ability to determine what PSTN numbers a customer of a customer has > right to use. You have a PBX with PSTN numbers, I have a wholesale customer > who sells you IP trunking for outbound LD. You set your switch to use the > proper ANI so people who call back some in on your PSTN lines. > > Your direct "LD company" may have no switch, and your PBX may be trunked > directly to me, but I do not know who you are. So I have no one to contact > and verify ANI, the company who does know who you are has no way to verify > what ANI you send, and in any case, it is none of our business.
With all due respect, that's your problem. When calls are dumped into the PSTN, they *have* to have valid ANI; too much of the semantics of the entire remainder of the PSTN depends on it. If that impairs the ability of some to interact with subscribers to the PSTN, then they'll have to find another way to cope with it. If you mean what I think you mean by "aggregators" -- intermediate carriers who bridge traffic from smaller edge providers to the PSTN, then your responsiblity is to require that of your edge providers by contracts with teeth. But there has to be an ANI, and it has to point somewhere valid -- even if it's the edge provider itself as proxy for the end sub. Cheers, -- jra -- Jay R. Ashworth Baylink [EMAIL PROTECTED] Designer The Things I Think RFC 2100 Ashworth & Associates http://baylink.pitas.com '87 e24 St Petersburg FL USA http://photo.imageinc.us +1 727 647 1274 Those who cast the vote decide nothing. Those who count the vote decide everything. -- (Joseph Stalin) _______________________________________________ --Bandwidth and Colocation Provided by http://www.api-digital.com-- asterisk-biz mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-biz
