In message 1206117116.958931@colossus.enigma.id.au,
Paul Day <pauls@enigma.id.au> Proclaimed from the tallest tower:

> On Fri, 21 Mar 2008 21:09:03 in aus.comms.mobile A Mate may have
> written:
>> sandyhiller - you're bullshitting - OR you are the victim of a
>> scamster who has hacked the phone system!!
>
> O|-| |\|035!!!11! 50m30n3 p\/\/\|\|z0r3|> |>4 f0|\|3z!!!1!!!1
>
> Nope, it's a perfectly normal use of SS7 signalling. If you control
> the signalling, you can set it to whatever the hell you want.
>
>> Most phone systems throughout the world permit blocking of individual
>> numbers!
>
> 'fraid not.
>
> PD

In the UK, BT will (or certainly used to) do this. Some years ago, my friend
had problems with nasty phonecalls. BT setup some service on their phone so
that they can type a series of numbers to block calls from a specific
number. Also, they can dial a code during or straight after a phone call to
block further calls from that number. AIUI, if the caller tries to phone
them again from a blocked number, they just get the number not-available
tone...

--
Regards,
Chris.
(Remove Elvis's shoes to email me)