Gsma Fs.38 __top__

CSPs must secure the internal core layer located behind the access network and interconnect border controllers. Isolating functional SIP elements via strict firewall zones prevents internal lateral movement if a perimeter edge device is compromised. Approaching FS.38 Compliance and Testing Interworking Security - GSMA

With the rise of VoLTE, VoNR (Voice over New Radio) in 5G, and Fixed-Mobile Convergence (FMC), SIP is no longer isolated to the core network. It is exposed to the internet, roaming partners, and user devices. Key threats addressed by FS.38 include: gsma fs.38

The applications of GSMA FS.38 are diverse and widespread, spanning multiple industries and use cases: CSPs must secure the internal core layer located

The document addresses the growing vulnerability of SIP as it becomes the primary protocol for voice and multimedia services. It shifts the focus from traditional hardware-only defenses (like standalone Session Border Controllers) toward a more active, intelligence-driven security posture. Key Security Recommendations It is exposed to the internet, roaming partners,