There are valid use cases for spoofing caller ID. It’s been a long time since I dabbled with Asterisk (IP PBX), IIRC, by default the call forwarding/redirectio

There are valid use cases for spoofing caller ID. It’s been a long time since I dabbled with Asterisk (IP PBX), IIRC, by default the call forwarding/redirection function uses metadata from the original incoming call. Let’s say, you’ve programmed your PBX that after 30 seconds of incoming call ringing, you want to redirect/forward the call (that is to make a new leg, and then connect them together) to your mobile phone number. I’m pretty sure, on your mobile phone you’d want to see the original caller’s number for incoming call, not the PBX’s phone number.