: Attackers exploit weak SIP endpoint authentication to hijack SIP trunks or user accounts. They then route massive volumes of unauthorized international calls to premium-rate numbers they control.
Ensuring the network can handle security overhead without impacting service availability.
FS.38 introduces standardized security assessment criteria. It outlines strict guidelines for telecom pentesting and vulnerability assessments. This allows mobile operators to aggressively check their live networks for configuration weaknesses, protocol violations, and zero-day vulnerabilities before they are exploited by bad actors. Critical Threats Mitigated by FS.38 Compliance
For decades, telecommunications security was gated by the inherent obscurity of private Signaling System 7 (SS7) networks. The transition to 4G and 5G networks completely upended this model. gsma fs.38
While Session Border Controllers remain an essential piece of the puzzle, FS.38 details additional mechanisms required to achieve robust, end-to-end SIP security.
Flood stateful SIP servers to drop legitimate user registration and call routing.
: Voice is no longer handled by circuit-switched hardware. It is compressed into data packets and routed via SIP over standard IP networks. : Attackers exploit weak SIP endpoint authentication to
GSMA FS.38: Securing the SIP Backbone of Modern Telecom In the modern telecommunications landscape, the shift toward networks has fundamentally changed how we communicate. While protocols like Session Initiation Protocol (SIP) have enabled the seamless delivery of Voice over LTE (VoLTE), Voice over Wi-Fi (VoWiFi), and Rich Communication Services (RCS), they have also introduced a new frontier of cyber threats.
Outlines scenarios where SIP vulnerabilities are exploited for financial gain, such as toll fraud or subscription fraud. Technical Recommendations
While the GSMA SGP.02 architecture defines the pipes (how data moves), FS.38 defines the cargo (what the data Critical Threats Mitigated by FS
: While some GSMA documents are public, FS.38 is typically a Members Only resource. Key Security Domains Covered
Unprotected SIP networks are susceptible to toll fraud, unauthorized session hijacking, and eavesdropping.