Prowid course material: https://kurslar.prowid.com/en/index.php?id=lesson&m=4074
LTE/4G and the EPC Core · Section 3. LTE and EPC Protocol Stack
S6a Interface (TS 29.272): AIR/AIA, ULR/ULA, CLR/CLA, IDR/IDA, and PUR/PUA Exchanges
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