Prowid course material: https://kurslar.prowid.com/en/index.php?id=lesson&m=4094
LTE/4G and the EPC Core · Section 6. LTE and EPC Signaling Procedures
Attach — Phase 2: Subscriber Identification and EPS-AKA Mutual Authentication (AIR/AIA, RAND, AUTN, RES, KASME)
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