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