Registration messages
Registration messages: Reference
IMSI DETACH INDICATION 9.2.12
LOCATION UPDATING ACCEPT 9.2.13
LOCATION UPDATING REJECT 9.2.14
LOCATION UPDATING REQUEST 9.2.15
https://www.etsi.org/deliver/etsi_gts/04/0408/05.00.00_60/gsmts_0408v050000p.pdf
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