Thread: Caller ID Spoofing

I didn't think it was possible to display a fake phone number on someone's caller ID, but some how, they're doing it: http://www.spoofcard.com/index.asp

Does anyone know how this works? Or what software they're using to acomplish this? ...You can test it out here: http://ws.cdyne.com/NotifyWS/phoneno...tifyPhoneBasic