how can I avoid validation of the caller id when I make a call to Twilio via trunk?

Question

When I redirect a call to Twilio via trunk I want to know the callerId of the first number and Twilio tells me that I need to verify the number first.

I call a phone number (phone1 to phone2) and the second one redirects the call to Twilio via trunk. I want to be able to identify phone1 without verifying it.