Gsma Fs.38 [2024]

Actively attempting to exploit vulnerabilities to find weak spots.

Focuses on protecting network infrastructure, such as Session Border Controllers (SBCs) and core network nodes, from unauthorized access and denial-of-service (DoS) attacks.

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Flooding IMS cores with SIP INVITE or REGISTER requests to crash telephony nodes.

┌─────────────────────────────────────────┐ │ GSMA FS.38 Framework │ └────────────────────┬────────────────────┘ │ ┌─────────────────────────────┼─────────────────────────────┐ ▼ ▼ ▼ ┌──────────────────┐ ┌──────────────────┐ ┌──────────────────┐ │ 1. Access Edge │ │ 2. Core Network │ │ 3. Interconnect │ │ (SBC/User UA) │ │ (IMS Hardening) │ │ (IPX Peering) │ └──────────────────┘ └──────────────────┘ └──────────────────┘ 1. Access Security (The User Domain) Interworking Security - GSMA gsma fs.38

The document emphasizes that security is not a "set and forget" task. It recommends:

The FS.38 document provides a comprehensive framework for securing SIP environments across fixed, mobile, and converged networks. It specifically targets: 1. Core Network Hardening

Enter . Officially titled the IoT Security Assessment Standard , this document is not merely another compliance checklist. It is the mobile industry’s gold standard for ensuring that IoT devices are built, deployed, and maintained with robust security controls. If you are a device manufacturer, a network operator, or an enterprise procurer of IoT solutions, understanding GSMA FS.38 is no longer optional—it is a business imperative.

It is widely regarded as the most complete SIP security standard for the telecoms industry. Actively attempting to exploit vulnerabilities to find weak

Addresses risks associated with the interception or exposure of subscriber identity and metadata within SIP signaling.

Sniffing or spoofing unencrypted SIP signaling headers to harvest user metadata or intercept communication.

: Flooding the network so no one can make calls.

: Measures to mitigate common SIP-based attacks such as toll fraud, session hijacking, and telephony denial-of-service (TDoS). Why It Matters This link or copies made by others cannot be deleted

FS.38 works alongside other standards like GSMA FS.21 to promote protocol correlation . This involves comparing data fields across different protocols (e.g., SIP, Diameter, SS7) to identify discrepancies that might signal fraudulent activity. Testing and Assessment Requirements

: By identifying evidenced risks and providing baseline controls, it enables operators to establish a strong security posture before an incident occurs.

FS.38 provides actionable guidance for and equipment vendors: