[asterisk-users] Area code 757 "Car warranty" calls

[Ronny Julian]

But from what I understand of SS7 it can be traced back with the 
cooperation of the carriers. I know we have traced a call setup (AMPS) 
across 3 carriers before.

Cary Fitch wrote:
> And getting a connection
> to a voice mailbox requires a 3 -way handshake so we can record the ip
> number the call originated from.  So it should be possible to generate
> a dns black list similar to the ones used for email spam.
>
> [Cary Fitch] 
> The problem is these are coming in from the PSTN and the SS7 link is back to
> the local switch/tandem, not to the originator.  
> CF
>
>
>
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