Re: The problem with blocking international and number-withheld calls
I believe it's being rolled out nationally now - it was reported on here some months ago.
The issue with this though is that most international calls arriving in the UK don't use the BT network. Another telco handles the call and passes it over an interconnect to BT, if it's a call for a BT provided line. There's no way for BT to know if the CLI is good or not. There's no telco equvalent of a mac address - all a telco knows is who passed the call to them.
Biting the hand that feeds IT
