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

[Cary Fitch]

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