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Caller ID

In this article

Caller ID is a telephone system feature that displays the caller’s phone number or name (if available) on the recipient’s phone or caller identification device before answering the call. It helps users identify who is calling them before deciding whether to answer the call or not.

How does Caller ID work?

  1. When a call is initiated, the caller’s telephone number and other relevant information are transmitted as signaling data along with the call.
  1. The recipient’s telephone service provider receives this signaling data and processes it to extract the caller’s information.
  1. The recipient’s phone or caller identification device then displays the caller’s phone number or name (if available) based on the received information.

What is a CNAM?

CNAM (Caller ID Name) is a component of Caller ID that provides the recipient with the name associated with the caller’s telephone number. CNAM is often used in conjunction with Caller ID to enhance the caller identification process by displaying the caller’s name along with their phone number. It works by querying a central database that matches phone numbers to names and then transmitting the matched name to the recipient’s phone or caller identification device along with the caller’s phone number.

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