Gsma Fs.38 [upd] Jun 2026

About the Author: This guide is based on GSMA FS.38 v3.0 (March 2023). Always consult the latest version from the GSMA Association for any updates or amendments.

Historically, SIP DoS attacks were volumetric—flooding a network with millions of raw SIP INVITE messages to crash an application server. While modern auto-scaling cloud cores and advanced SBCs can handle high-volume floods, attackers have pivoted toward .

Offers recommendations for interconnect signaling security, which have been updated to align with the SIP guidelines in FS.38. gsma fs.38

As 5G Standalone (SA) rollouts accelerate globally, SIP network security is becoming even more vital. 5G relies heavily on cloud-native software containers and edge computing. Despite this virtualization, the underlying voice and rich communication services (RCS) still leverage SIP.

For device makers, achieving FS.38 certification is a competitive differentiator. For network operators, it is a risk management tool. For end-users, it is the silent guarantee that the smart meter in their basement or the tracker on their logistics fleet operates with integrity. About the Author: This guide is based on GSMA FS

Could you please clarify what you’re referring to? For example:

: Voice is no longer handled by circuit-switched hardware. It is compressed into data packets and routed via SIP over standard IP networks. While modern auto-scaling cloud cores and advanced SBCs

The GSMA FS.38 standard offers several benefits: