name: CLI
full_form: Calling Line Identification
context: related to their customers (depending on national regulations). But CLI can also be misused to display a misleading number in the display that is in no way related to the originator of the call. This behaviour is called CLI spoofing or spoofed call. CLI spoofing ranges from harmless hoax to criminal activities like for example Voice Phishing (vishing) by displaying the forged number of a bank in order to steal the callee's credentials. And although CLI may be unreliable, people use it to decide whether to accept a call or not. This study item studies the detection of a spoofed call as the first step, and prevention as a second step if detection is achievable. In particular, the goals of this document are: Outline valid threat scenarios for spoofed calls coming to and CS domains; Analyze and evaluate if any tools in 3GPP can be used to counteract spoofed call detection and prevention; Study and identify any other suitable techniques or mechanisms for spoofed call detection and
description: Calling Line Identification (CLI) is a parameter that identifies the calling party's telephone number. It is used to display the caller's number on the callee's device, allowing them to decide whether to accept the call or not.
explanation: The context explicitly states that CLI is a parameter used for identifying the calling party's number.
section_title: 1	Scope
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