Prowid course material: https://kurslar.prowid.com/en/index.php?id=lesson&m=4133
LTE/4G and the EPC Core · Section 9. Voice in LTE (Pre-IMS), Roaming, and 2G/3G Interworking
Fallback to 3G/2G When Losing LTE Coverage: Inter-RAT Mobility and S3/S4 vs. Gn/Gp Interfaces
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