What is ANI (Automatic Number Identification)?
ANI (Automatic Number Identification) is a telephony feature that identifies the originating/billing number of a caller and passes it to the receiving end. Originating in the North American PSTN, ANI is often used interchangeably with CLI, but they differ: ANI reflects the billing line and is harder to alter, while CLI (caller ID) is the display number the callee sees and can be spoofed. See /answers/what-is-cli and /answers/what-is-did.
Need help wiring this up?
The pages below are the products and integration guides that put this concept on the wire. If you'd rather walk through it live, our engineering team takes calls same-day during MENA working hours.
Talk to our engineering teamWas this answer helpful?
Your vote helps us prioritise which answers to expand with examples, diagrams, and code snippets.
Talk to a real engineer about your build.
We reply within one business day, and production accounts get 24/7 support. Our solutions engineers ship code, not scripts.