CLI Spoofing (Calling Line Identification Spoofing)

CLI Spoofing in context

Security controls in telecom span signaling firewalls (SS7/Diameter/GTP screening at the network edge), transport encryption (IPsec, TLS, PRINS), identity and access on OSS/BSS, and monitoring at both the packet and log level. Controls are audited against GSMA FS.11/FS.19/FS.20/FS.36 and, in Europe, NIS2 sectoral rules.

Telecom threats range from opportunistic SMS phishing and SIM swap to nation-state grade location tracking and lawful-interception abuse. The common thread is that most attacks exploit the inherited trust model of legacy signaling. SS7 and Diameter were designed for a closed operator community that no longer exists.

To place CLI Spoofing in the wider telecom-security picture, review Call Spoofing, Flash Call Fraud, MAC Filtering, MNP, OAM and Vishing.

Related terms

• Call Spoofing
• Flash Call Fraud
• MAC Filtering
• MNP
• OAM
• Vishing
• Global Title Abuse
• STIR/SHAKEN

Related topic hubs

• Telecom Fraud IRSF, Wangiri, SIM box, PBX hacking and CLI spoofing.
• Diameter Security 4G/LTE Diameter threats across IPX/roaming and DEA defenses.
• Diameter Attacks S6a IDR/PUR/CLR abuse, subscriber tracking, LTE signaling attacks.
• Routing Area Update GPRS/UMTS RAU procedure and attack surface.

More from the TelcoSec Glossary

Browse the full TelcoSec Glossary, the Ultimate Guide to Mobile Network Security, or the P1 Arsenal of telecom-security tools.