I always thought this would be simple for the major carriers with with network-transfer arrangements. For example if Verizon passes a call from inside it's network to AT&T, then it must certify the origin of the call (CA? some other certificate or signature?). The certification would have some means of verification via Verizon. If Verizon passes too many offending calls to AT&T then AT&T has some recourse (blocking all inter-network traffic, marking calls as SPAM, only allowing customer-authorized calls through). So if you were a smaller carrier, or a non-US carrier, or a VOIP carrier you would either be quickly out of business or else be very diligent in not allowing robo-callers on your network. Each carrier would implement some sort of simple reporting mechanism that would allow a *00 sort of 'call-was-spam' reporting. This would mean less crap traffic for the carriers and happier customers.
I can't imagine it's that difficult to do. But they get revenue from those calls even if they don't originate on their network. It's traffic and someone pays for it. Grant M. On Mon, Dec 7, 2015 at 12:34 PM, Daniel Barrett <[email protected]> wrote: > On December 7, 2015, Daniel C. wrote: > >How would such filtering tools work, and how effective would they likely > be? > > I have read (but don't remember where) that the signature of these > types of calls, with their fake caller ID and international origin, is > detectable. > > -- > Dan Barrett > [email protected] > > _______________________________________________ > Discuss mailing list > [email protected] > http://lists.blu.org/mailman/listinfo/discuss > -- Grant Mongardi Senior Systems Engineer NAPC [email protected]http://www.napc.com/blog.napc.com 781.894.3114 phone 781.894.3997 fax NAPC | technology matters _______________________________________________ Discuss mailing list [email protected] http://lists.blu.org/mailman/listinfo/discuss
