Gsma Fs.38 Verified Jun 2026

Exploiting SIP for unauthorized calls, toll fraud, and premium rate fraud.

is a comprehensive technical document that provides best practices and recommendations for securing SIP-based network nodes, access points, and interconnects. It represents an "overarching, end-to-end" approach to SIP security, filling the gap between existing standards (like IETF RFCs and 3GPP standards) by focusing on real-life attacks and practical countermeasures.

One of the central themes of FS.38 is the strategic use of . These devices are essential for: gsma fs.38

The GSMA FS.38 specification includes several key features that ensure secure authentication and interoperability:

The GSMA FS.38 specification focuses on several key aspects of secure mobile authentication: Exploiting SIP for unauthorized calls, toll fraud, and

represents a maturing industry. No longer can IoT devices be shipped with gaping security holes and fixed with a "future update." The era of connected everything demands connected security everywhere.

┌─────────────────────────────────────────┐ │ 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 One of the central themes of FS

The document categorizes SIP-related risks into three primary domains: