ANI stands for which of the following?

• A. Automatic Number Identification
• B. Automatic Number Interface
• C. Active Number Identification
• D. Advanced Number Interface

Answer: (A)

Automatic Number Identification is the system in telephone networks that automatically reveals the number of the calling party as the call is routed. This helps with routing, billing, and emergency services by identifying who is making the call. It’s about identifying the number, not about an interface or a descriptor like active or advanced. The other terms aren’t standard telephony terms for this concept, since they imply interfaces or attributes rather than the identification of the caller’s number.