[Asterisk-Users] VoIP hackers gut Caller ID

[rich allen]

what do you mean "not quite right"???

if the clid is supposed to be blocked then don't send it. if the far 
end is a law enforcement or emergency agency then the clid is NOT 
supposed to be blocked!! if the originating switch had the ability to 
send or not send, problem solved for voip providers from getting a 
"blocked clid"

- hcir

On Jul 7, 2004, at 1:47 PM, Steve Kennedy wrote:

> On Wed, Jul 07, 2004 at 07:57:36AM -0800, rich allen wrote:
>
>> this is really simple, companies like Nortel, Lucent need to change
>> their code for caller id, if the number should be blocked then dont
>> transmit it to the far end switch
>
> Err, not quite right.
>
> There are a few circumstances when called ID can be blocked (it's
> rumoured certain spook agencies have this ability), however if a "user"
> withholds CID, then it's just flagged at the local switch and passed
> switch to switch with the withold CLI flag. The terminating switch
> should then NOT pass on CLI if the withold flag is set on to an 
> end-user
> line.
>
> Of course some agencies will get CLI passed even if the withold flag is
> set (in the UK, Police, fire, etc, potentially even ISPs for abuse
> purposes - but they are not meant to abuse the privilige).
>