Gsma Fs.38 ~upd~

"message_id": "fs38-20260410-0001", "timestamp_utc": "2026-04-10T12:34:56Z", "schema_version": "1.0", "sender_id": "operator-a", "event": "event_type": "SIM_SWAP", "msisdn": "+441234567890", "imsi": "234150123456789", "confidence_score": 88, "evidence": "detection_method": "OMA-SDM-signals", "log_refs": ["log-789", "cdr-4521"] , "recommended_action": "action_code": "TEMP_BLOCK", "suggested_ttl_seconds": 3600

Adopt if you are a consortium of telcos or neutral hosts. Avoid if you are a single enterprise building a private edge. gsma fs.38

: Techniques to ensure that signaling messages are not tampered with and that only authorized users or peers can initiate sessions. "event": "event_type": "SIM_SWAP"