Prowid course material: https://kurslar.prowid.com/en/index.php?id=lesson&m=3785
5G: NR, 5GC Core and VoNR · Section 16. Incident Case Studies (31 Real Cases), Troubleshooting Methodology, and Capstone Project
Case 17: N4 Interface Outage Between SMF and UPF (PFCP Association and Heartbeat Failure)
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