[Tfug] OT - Telemarketing calls with fraudulent caller ID

[Adrian]

On Thursday 24 August 2006 20:39, George Cohn wrote:
> Adrian wrote:
> 
> > Who ever is doing it 
> > clearly knows exactly what they are doing, picking un-assigned numbering 
> > ranges and having their PBX send out fraudulent CIDs in those ranges to 
try 
> > and mask their true location. Unfortunately... until someone in a CO 
starts 
> > going over the transfer records, it looks like this will continue 
unabated.
> >
> 
> It's trivially easy to spoof caller ID in any current pbx.  In the big 
> Nortel switches that I work on, there are user configurable tables that 
> define how the caller ID is built, based on the area code, CO prefix, 
> and DID or non-DID extension.
> 

Yep, same as the Mitel system I use to work on from time to time.

[snip]
> If you want to know more about how area codes and central office numbers 
> are assigned, take a look at http://www.nanpa.com/ which is the central 
> authority that oversees the North American Numbering Plan.
> 

Ummm yep.. hehehe... Where else do you think I would go to verify the CO 
prefixes (NXX) were fraudulent. ;)

Adrian