HI2 (Lawful Interception (Handover Interface 2))

The interface delivering content of communication from the network to law enforcement per ETSI LI model. HI2 carries intercepted communications (voice, SMS, data) along with associated metadata.

Categories: Security ControlsThreats and AttacksProtocols and Standards

HI2 in context

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

Telecom threats range from opportunistic SMS phishing and SIM swap to nation-state grade location tracking. The common thread is that most attacks exploit the inherited trust model of legacy signaling protocols.

To place HI2 in the wider telecom-security picture, review Cipher Downgrade Attack, Mediation Device (Lawful Interception), OAM, RPKI, SCADA and UEA — each entry cross-references back to this page so you can walk the topic in either direction.

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