Gsma Fs.38 Today

Before GSMA FS.38, SIM profiles were largely proprietary. A profile built by one vendor might only work on chips from that same vendor. FS.38 changed this by defining a generic, neutral format for how a SIM profile is described, packaged, and loaded onto an eUICC (embedded Universal Integrated Circuit Card).

The document is titled "SIP Network Security" . It is a Permanent Reference Document (PRD) published by the GSM Association (GSMA) that provides a comprehensive global standard for securing Session Initiation Protocol (SIP) based networks, particularly in the context of Voice over LTE (VoLTE) and 5G . Core Purpose and Scope gsma fs.38

, SIP has become the primary signaling protocol for voice and multimedia services. FS.38 provides a comprehensive framework to secure these services by: Defining the Attack Surface Before GSMA FS

If you need to dig deeper into the technical "how," FS.38 defines the following specific mechanisms: The document is titled "SIP Network Security"

How to signaling so hackers can't read the call setup data.