IDS (Intrusion Detection System)

An Intrusion Detection System monitors network traffic or host activity for patterns indicative of attack and raises alerts. Unlike an IPS it does not block traffic in line, which avoids the risk of disrupting legitimate flows. Modern systems combine signature, anomaly, and behavioural detection and feed a SOC's SIEM and SOAR pipelines.

Categories: Security ControlsThreats and AttacksInternet and Routing

IDS 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 IDS in the wider telecom-security picture, review BGP Hijacking, Egress, IPS, EDR, LAN and OAM.

Related terms

Related topic hubs

  • Diameter Attacks S6a IDR/PUR/CLR abuse, subscriber tracking, LTE signaling attacks.

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