Prowid course material: https://kurslar.prowid.com/en/index.php?id=lesson&m=4131
LTE/4G and the EPC Core · Section 9. Voice in LTE (Pre-IMS), Roaming, and 2G/3G Interworking
CSFB: SGs Interface (MME–MSC/VLR), Combined Attach, Fallback to 2G/3G, and Fast Return
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