When a call originator changes the calling number to hide or change which calling number is shown on the call display, this is considered as Call Spoofing. An example of a legal use of spoofing is to present a main callback number for customer support or to keep a calling number private such as when a doctor contacts a patient from their private phone. Illegal spoofing of numbers is done to avoid detection or trick users into picking up unwanted calls. STIR/SHAKEN will reduce illegal Caller ID spoofing.