CLI / CID / DID what is it?

Understanding CLI, CID, and DID in Your PBX System

When building your own phone PBX system, it's crucial to understand a few core concepts—specifically CLI (Calling Line Identification), CID (Caller ID), and DID (Direct Inward Dialing). These directly impact how calls are routed, identified, and presented, both inbound and outbound.

We’ll break down what each of these means, why they matter, and how to configure them properly in your setup. Let’s dive in.

‣