[Asterisk-Users] VoIP hackers gut Caller ID

[Thilo Salmon]

> However if I set the CallerID digits to anywhere within our 100-number block
> DID range, the exchange will happily pass on the specific number... guess it
> might be a combination of Euro ISDN standards and how the local telco's
> configure the exchanges.

Interesting. Our incumbent "Deutsche Telekom" sells a disabled screening
on a BRI port for 2,x Euros per month to anybody who asks. To be fair
they will set the screening indicator to 'user provided, not screened',
so in theory a called party could tell (one can on another BRI line).
Unfortunately, the screening indicator does not appear on analog lines
or mobiles.

This "feature" really comes in handy, if you forward calls coming from
3rd parties to your mobile as you can preserve the original callerid and
can return any calls missed.

Thilo

P.S.: Don't worry about fake callerid coming from Germany. Any numbering
plan indicators will be set to national.