I work for a company that writes telecommunications software. EVERY piece of equipment that the call passes though gets the originating number, the destination number and a privacy indicator which dictates whether or not the number should be displayed at the final destination.
The privacy indicator is turned on when the caller dials 141, but the information is still sent (it needs to be for billing etc). The software at the receiving end should respect the privacy indicator and not display the originating number, but I'm sure that in many cases it can be overridden.
I don't know how to do that, it's probably manufacturer dependant. |