GSM, UMTS, LTE and 5G Standard Protocols and Procedures for Lawful Interception [pdf](etsi.org)
etsi.org
GSM, UMTS, LTE and 5G Standard Protocols and Procedures for Lawful Interception [pdf]
https://www.etsi.org/deliver/etsi_ts/133100_133199/133128/16.19.00_60/ts_133128v161900p.pdf
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