Back in February, I read Confessions of a Caller-ID Spoofer by Paul McNamara over at Network World. Caller-ID spoofing is a "feature" in many telephony platforms. Let me explain further. Showing the main billing number or master directory number listing on digital trunks for outbound calls is an old practice but substituting the number for someone else isn't. This is what McNamara points out in his article and this substitution is perfectly legal today, probably because it wasn't given any thought.