SIRT (Security Incident Response Team)

A Security Incident Response Team (also called CSIRT or CERT) is the group responsible for coordinating the detection, containment, eradication, and recovery from security incidents, plus the post-incident learning. Telecom SIRTs typically have direct relationships with national CERTs, GSMA T-ISAC, and law enforcement, and are engaged for both IT and signalling-layer incidents.

Categories: Security ControlsProtocols and StandardsInternet and Routing

SIRT 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 security is written into standards from 3GPP, GSMA, ETSI, IETF and ITU-T. Understanding which body owns which specification, and how the specs interlock (for example 3GPP TS 33.501 with GSMA FS.34 for 5G SBA security), is essential for both design and audit work.

To place SIRT in the wider telecom-security picture, review SLH-DSA, Suricata, ML-DSA, IPv6, SHA and CSIRT.

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