Gsma Fs.38 Here

As operators move away from legacy SS7 protocols—which have their own security guidelines like GSMA FS.11 —FS.38 provides the necessary outcome-based principles to handle modern IP-based signaling threats. It ensures that the of communications services are maintained even as networks become more open and interconnected. Interworking Security - GSMA

: Testing must include SIP endpoints, SBCs (which act as "SIP firewalls"), and even non-SIP nodes like provisioning servers. gsma fs.38