If you’re working with international VoIP traffic, you’ve probably come across CLI and ANI. But what’s the actual difference?

🔹 CLI (Calling Line Identification)
CLI is the caller ID information presented to the destination. It allows the receiving party to identify the number calling them.

🔹 ANI (Automatic Number Identification)
ANI is the network-level information used to identify the originating number. It can be used for billing, routing, and caller identification.

Why does it matter?

For international VoIP traffic, having valid and properly presented CLI/ANI can improve call completion, reduce call rejection, and help maintain route quality.

Before sending live traffic, it’s always a good practice to test CLI/ANI presentation and confirm that the route meets your requirements.

Understanding these basics can help carriers and VoIP buyers make better routing decisions.