Does that addition in the UK spec add any extra protection? I've never had a spam call with a spoofed number in the UK as far as I'm aware, and definitely never seen that thing that happens in the states where a call comes in showing the name or company name of the caller, even if they're not in the receiver's address book.
The UK spec adds a few fields which I can not remember all off the top of my head. One addition is the 'presentation' calling line identifier, which is screened like the 'calling party number'. The generic calling line identifier is not screened, hence the addition
