Blue Team

A blue team is the internal security function responsible for defending an organisation's networks, systems, and services, operating the SOC, hardening configurations, running detection engineering, and leading incident response. In telecom, the blue team's scope spans IT estate, signalling and RAN protection, fraud management, and integration with national CERTs and GSMA T-ISAC.

Categories: Radio Access NetworkSecurity ControlsFraud

Blue Team in context

The radio access network is the layer where mobile devices attach to the operator's infrastructure. Attacks in this layer include IMSI catching, rogue base stations, downgrade attacks and jamming, and defenses hinge on mutual authentication, integrity-protected signaling and Open RAN supply-chain hygiene.

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.

To place Blue Team in the wider telecom-security picture, review PBX, GSMA Open Gateway, Machine Learning (ML), SOC, 2G and Billing System.

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