Gsma Fs.38 -

GSMA FS.38, titled " SIP Network Security ," is a Permanent Reference Document (PRD) released by the GSMA Fraud and Security Group (FASG)

GSMA FS.38

is a technical specification published by the GSMA’s Fraud and Security (F&S) team that defines standardized formats, processes, and operational guidance related to the secure exchange of fraud and security-related data between mobile network operators, service providers, and trusted third parties. It focuses on enabling timely detection, sharing, and mitigation of mobile network fraud, SIM fraud, subscription fraud, and related threats through consistent data schemas and interoperable message flows. gsma fs.38

Below is a structured overview of its core components and why it is essential for Mobile Network Operators (MNOs) and Communication Service Providers (CSPs). 🛡️ Why GSMA FS.38 Matters Traditionally, the industry relied heavily on Session Border Controllers (SBCs) as the sole defense for SIP networks. shifts this mindset toward a "Defense in Depth" GSMA FS

GSMA FS.38 provides a comprehensive framework for 5G network slicing, covering several key areas: Fraud event reports (e

• Fraud event reports (e.g., SIM cloning, SIM swap, subscription takeover)
• Subscriber risk indicators and reputation scores
• Blocking or quarantine requests for suspicious identifiers (MSISDN, IMSI, IMEI)
• Provenance metadata and confidence levels
• Triage and escalation information for cross-operator investigations