On Sun, May 13, 2007 at 01:54:08AM +0100, Chris Bagnall wrote:

> > 3. a list of bogus entries..so when you look at it, you know it's a
> > fake phone number...one that recently came in that got me thinking
> > this was 407 111 1111.
> I don't know much about the legal position over the other side of the pond, 
> but I'm pretty sure that in the UK caller ID spoofing is illegal. There's 
> nothing to stop you withholding your CLI of course, but to deliberately fake 
> someone else's CLI (whether it exists or otherwise) pushes you over the line.
> Is the same not the case in the US?

I don't know if it's illegal (it would fall under the Comms Act if it
was), but I know it's discouraged. There are legal reasons you might
spoof CLI. Most telcos will have agreements that end-users can't do
nasty things with CLI (withholding doesn't actually block anything, just
flags the CLI should be withheld, so telcos, law enforcement etc still
get it).

Quite a few SS7 providers will allow customers to do what they like with
CLI, just have an agreement they wont do anything they shouldn't.


Steve

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